To provide an electrical power tool capable of inexpensively and rationally realizing low vibration and low noise.

A structural body 20 having a parallel surface in the axial direction of a motor 2 is interposed between a stator 2b of the motor 2 and a housing 3 on a disc grinder (electrical tool) 1 with the motor 2 as a driving source built-in in the housing 3. Hereby, a passage of motor cooling air is formed of the parallel surface of the structural body 20, an outer surface of the stator 2b and an inner surface of the housing 3. Additionally, the structural body 20 is constituted of an elastic body or the whole or a part of the structural body 20 is constituted of a viscoelastic body. Furthermore, the structural body 20 is constituted of a member having higher heat conductivity than that of the housing 3.