gitudinal direction of the battery 90 is oriented in the lat- eral direction. Therefore, the handling of the chain saw 1 having the battery 90 increased in size, during opera- tion,isimproved,andthe chain saw 1A isreduced in size. 

[0066] In the chain saw 1A of the first embodiment, when the battery 90 is mounted in the holding part 13, the upper end part of the battery 90 protrudes above the lower edge part H2 of the rear end part 42 of the t op handle 40, and protrudes above the upper edge part H1 of the rear end part 42 of the top handle 40. Setting the heightofthe battery90 in this manner allows forincreas- ing the powerand the charging capacity ofthe battery90. 

[0067] The chain saw 1A of the first embodiment in- cludes the battery part 12 inclined such that the upper partthereofispositionedposteriorto the lowerpartthere- of, to make the battery 90 inclined so as to be awayrear- ward fromthe gripping part43.Inthisconfiguration,even if the battery 90 is extended in the vertical direction, the upper part of the battery 90 does not hinder the operator when the operator grips the gripping part 43. Therefore, the battery 90 can be increased in size without the oper- abilityofthe chain saw 1A beingreduced,and the battery 90 is inclined as described above so that the lower part of the battery 90 is positioned more anterior than the up- perpart. Accordingly,the centerofgravity having the top handle 40 as an axis can be shifted frontward. 

[0068] Though the first embodiment of the present in- vention has been described above,the presentinvention is not limited thereto and can be appropriately modified within the scope of the present invention as defined by the claims. 

[0069] As shown in FIG.2,the chainsaw 1A according to the first embodiment includes the three parts, which are the first interference reduction part 100, the second interference reduction part200,and the third interference reduction part 300. However, the chain saw 1A may in- clude at least one of the first interference reduction part 100,the second interference reduction part 200, and the third interference reduction part 300. 

[0070] The chain saw 1A of the first embodiment is configured such that the top handle 40 is to be gripped by the right hand. When the top handle 40 is configured to be gripped by the left hand, for example, the first in- terference reduction part 100, the second interference reduction part 200, and the third interference reduction part300 may be formed onthe opposite side in the lateral direction with respect to the top handle 40. 

[0071] Though the chain saw 1A applied with presentinvention has beendescribed in the presentem- bodiment, an electric power work device applicable with the present invention is not limited to a chain saw, and the present invention is applicable to various kinds of electric power work devices such as a brush cutter, a hedge trimmer, and a blower. 

## [Second embodiment] 

[0072] Next, a description will be given of a chain saw 

1B according to a second embodiment of the present invention. 

[0073] The chain saw 1B of the second embodiment has substantiallythe sameconfiguration as the chain saw 1A of the first embodiment (see FIG. 2), and is different in thata fourthinterference reduction part400 isincluded therein. 

[0074] As shown in FIG. 5, the fourth interference re- duction part 400 is formed by the battery 90 mounted in the battery part 12 so as to have the center in the lateral direction of the front end part of the battery 90 is posi- tioned leftward with respect to the center in the lateral direction of the rear end part of the battery 90. 

[0075] The holding part 13 of the battery part 12 in the second embodiment greatly protrudes more leftward than rightward with respect to the center in the lateral direction of the gripping part 43 of the top handle 40. 

[0076] In the chain saw 1B ofthe second embodiment, the battery part12 andthefrontpart of the battery90 are shifted leftward with respect to the rear part thereof, so that the palm holding the top handle 40 or wrist of the right hand is easily shifted leftward. 

[0077] Thus, with the chain saw 1B of the second em- bodiment, the interference with the palm holding the top handle 40 or the wrist is reduced during operation, and the degree of freedom of the hand movement is creased. Therefore, the handling during operation and working efficiency are improved. 

[0078] As described above,though the second embod- iment of the present invention has been described, the present invention is not limited thereto and can be ap- propriately modified within the scope of the present in- vention as defined by the claims,similarly to the firstem- bodiment. 

[0079] The chain saw 1B of the second embodiment may include, in addition to the fourth interference reduc- tion part 400, at least one of the first interference reduc- tion part100,the second interference reduction part200, and the third interference reduction part300.Further,the chain saw 1B of the second embodiment may include only the fourth interference reduction part 400. 

[0080] When the chain saw 1B of the second embod- iment is configured to include the top handle 40 so as to be gripped by the left hand, the fourth interference re- duction part 400 may be formed on the opposite side in the lateral direction with respect to the top handle 40. 

## [Third embodiment] 

[0081] Next, a description will be given of a chain saw 1Caccording to a third embodimentofthe presentinven- tion. 

[0082] The chain saw 1C according to the third em- bodimenthassubstantiallythesameconfigurationasthe chain saw 1A accordingto the firstembodiment(see FIG. 2), and is different in that a fifth interference reduction part 500 is included therein. 

[0083] As shownin FIG.6, the fifth interference reduc- 

