To suppress vibration and noise from a motor serving as a fan driving source for attainment of a silent motor blower by forming hole-shaped or groove-shaped cavities at both surfaces of the front and back of a motor bearing supporting member consisting of cushioning material, which supports the bearing part of a motor for motor blower.

A brushless motor 4 generating rotational torque retains its bearing part 8 through a motor bearing supporting member 6. The motor bearing supporting member 6 consisting of cushioning material having resiliency such as rubber involves a roughly disc-shaped part 6A as a basic element, a hole 6B for fitting the bearing 8 at its axial part, a plurality of arc-shaped cavity holes 6C from the front surface side, and a plurality of groove-shaped cavities 6D from the back surface side, which are formed alternately. It is possible to increase the apparent length of the motor bearing supporting member 6 led to a case 1 from the bearing part 8 of the brushless motor 4, thereby causing vibration and noise from the brushless motor 4 to be dampened and absorbed easily.