of a rear side of a base part of a drum type washer according to the present invention referring to fig4 to 6 hooks 106 are 106 provided to both sides of a lower portion of the base part 101 respectively and recesses are provided to portions of the drum 6 to oppose the hooks 106 respectively so the hooks 106 are elastically fitted into the recesses to be locked together respectively hence a pre assembly between the base part 101 and the drum is achieved and a position for a locking of a locking member 105 such as a fixing bolt can be automatically aligned alternatively the hooks 106 are provided to the drum and the recesses for the hooks 106 can be provided to the lower surface of the base part 101 a rear portion 101 a of the base part 101 as shown in the drawings is projected upward and is fixed to the rear side of the drum by a locking of a fixing member 104 such as a fixing bolt 104 for this a locking hole 104 a is formed at the rear portion 101 a of the base part 101 the fixing member 104 passes through the rear side of the drum to be locked into the locking hole 104 a preferably the fixing member 104 is locked to the portion where the spider cf u2018 8 u2019 in fig1 or fig2 joining the drum and a bearing housing together in the rear lateral side of the drum preferably a locking boss 105 a is provided to a front portion of the base part 101 to be externally locked with the locking member 105 such as a bolt hence if the fixing member 105 is locked into the locking boss 105 a to enable.