tion part 500 is configured by the battery 90 mounted in the battery part 12 so as to have the center in the lateral direction oftheupperend partofthe battery90 positioned leftward with respect to the center in the lateral direction of the rear end part of the battery 90. 

[0084] The chain saw 1C of the third embodiment in- cludesthe holding part13 (see FIG.4)of the battery part 12 inclined such that an upper end part thereof is posi- tioned more leftward with respect to the lower end part thereof. 

[0085] In the chain saw 1C of the third embodiment, the upper end part of the battery 90 is shifted more left- ward with respect to the lower end part thereof, so that the palmholding the tophandle 40 orthe wristofthe right hand can be easily shifted leftward. 

[0086] Thus,with the chain saw 1C ofthe third embod- iment,the interference with the palmholding the tophan- dle 40 or the wrist is reduced during operation, and the degree of freedom of the hand movement is increased. Therefore,the handling duringoperation andworking ef- ficiency are improved. 

[0087] As described above, though the third embodi- ment 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 asdefinedby the claims, similarly to the first em- bodiment. 

[0088] Thechain saw 1C of the third embodiment may include, in addition to the fifth interference reduction part 500, at least one of the first interference reduction part 100 (see FIG. 2), the second interference reduction part 200 (see FIG.2),the third interferencereduction part300 (See FIG. 2), and the fourth interference reduction part 400 (see FIG. 5). Further, the chain saw 1C of the third embodiment may include only the fifth interference re- duction part 500. 

[0089] When the top handle 40 in the chain saw 1C of the third embodiment is configured to be gripped by the left hand, the fifth interference reduction part 500 formed on the opposite side in the lateral direction of the top handle 40. 

## [Explanation of symbols] 

[0090] 1A:chain saw (firstembodiment),1B:chain saw (second embodiment), 1C: chain saw (third embodi - ment), 10: body case, 11: body part,12: battery part, 13: holding part, 13c: inclined surface, 14: battery case, 20: cutting part, 21: guide bar, 22: saw chain, 30: motor, 40: top handle, 43: gripping part, 45: thumb rest, 46: power switch, 47: indicator light, 50: side handle, 90: battery, 90c: recess, 90d: inclined surface, 100: first interference reduction part, 200: second interference reduction part, 300: third interference reduction part, 400: fourth inter- ference reduction part, and 500: fifth interference reduc- tion part. 

## Claims 

1. An electric power work device (1A) comprising: 

5 

10 

15 

20 

25 

30 

2. An electric power work device (1A) comprising: 

35 

40 

45 

50 

55 

a body case (10); a work tool (20) protruding forward from front side with respect to the body case (10); a motor (30) to drive the work tool (20); and a battery(90)to supply electricpowerto themo- tor (30), wherein the motor (30) is accommodated in the body case (10), a top handle (40) is extended in a longitudinal direction at an upside with respect to the body case (10), a side handle (50) is provided at one of a right side surface and a left side surface of the body case (10), the battery (90) is detachably mounted in a bat- terypart(12)formed behind the top handle (40), and an interference reduction part (100) is formed behind the top handle (40) to reduce interfer- ence with a palm holding the top handle (40) or a wrist, wherein the interference reduction part (100) is configured that an upper end part of a part of the body case (10), facing a front surface of the battery (90), is positioned lower than an upper end part of the top handle (40), at a corner be- tween a frontsurface ofthe battery part(12)and the other of the right side surface and the left side surface. 

a body case (10); a work tool (20) protruding forward from front side with respect to the body case (10); a motor (30) to drive the work tool (20); and a battery(90)to supply electricpowerto themo- tor (30), wherein the motor (30) is accommodated in the body case (10), a top handle (40) is extended in a longitudinal direction at an upside with respect to the body case (10), a side handle (50) is provided at one of a right side surface and a left side surface of the body case (10), the battery (90) is detachably mounted in a bat- terypart(12)formed behind the top handle (40), and an interference reduction part (200) is formed behind the top handle (40) to reduce interfer- ence with a palm holding the top handle (40) or a wrist, wherein the interference reduction part (200) is 

