Motor

A motor, which is an inner rotor motor, the motor comprising:

• a shaft rotating about a central axis extending vertically in an axial direction;
• a rotor rotating together with the shaft;
• a stator located radially outside of the rotor;
• a casing accommodating the rotor and the stator therein;
• a bearing holder fixed to the casing;
• and
• a first bearing interposed between the bearing holder and the shaft;
• wherein
• the bearing holder includes a holder main body made of a resin and a ring made of a metal which holds an outer ring of the first bearing;
• the holder main body includes, around the central axis, a first arcuate portion including one or a plurality of through-holes passing therethrough in an axial direction and a second arcuate portion that does not include a through-hole;
• the first arcuate portion occupies a range of about ⅓ or more of a total circumference of the holder main body in a circumferential direction;
• and
• a difference between a thermal expansion coefficient of a material of the outer ring of the first bearing and a thermal expansion coefficient of a material of the ring is smaller than a difference between the thermal expansion coefficient of the material of the ring and a thermal expansion coefficient of the material of the holder main body.