Electric storage unit for vehicle outside mirror device, and vehicle outside mirror device

An electric storage unit for a vehicle outside mirror device that electrically rotates a mirror assembly with respect to a vehicle body, the electric storage unit comprising:

• a shaft fixed to the vehicle body via a base;
• a gear case rotatably attached to the shaft, the mirror assembly being attached to the gear case;
• a cover attached to the gear case;
• and
• a motor and a rotational force transmission mechanism housed in the gear case and the cover, wherein
• the gear case has an upright wall surrounding the motor and the rotational force transmission mechanism and the upper portion of the upright wall is open,
• the cover has a fitting wall fitted from outside onto the periphery of the upper portion of the upright wall and a cover wall covering the opening unit of the upright wall,
• the upright wall and the fitting wall are provided with a fitting member for assembling the gear case and the cover together, and
• the fitting member includes
• a fitting protruding unit provided on the gear case, and
• an elastically deformable fitting piece provided on the cover and having a fitting opening unit into which the fitting protruding unit is fitted, the elastically deformable fitting piece being configured to elastically deform in a direction of a center line of the shaft to be fitted with the fitting protruding unit.