The power module device of the present invention is assembled so that the assembly housing 1 and the power module 5, which form the close contact surface, are engaged with the outer grooves 3, 7 and the inner grooves 4, An outer rim 11 and an inner rim 12 which are respectively fitted to the outer grooves 3 and 7 and the inner grooves 4 and 8 are formed in the base mill 10 of the compression deformable material forming the cooling water tightness of the adhered surface It is possible to solve both the excessive time required for the assembly time and the difficulty in handling the sealant due to the hardening process which occurs when the airtight sealant is applied instead of the base milling 10, .
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