To provide a lighting body without influencing a mounting place or the attachment and detachment of a motor.

A cutout 15 is formed from a front end to a rear on the side face of a motor housing 6, and a light unit 16 is fitted on the cutout 15. The light unit 16 is a tabular body with a protrusion 17 protrudedly provided on a surface and a whole rear face formed into a concave face conforming to a housing hole 18 of a field 3 in the motor housing 6, and LEDs 21 and 21 capable of illuminating the front of a spindle 12 are housed in the protrusion 17.