Mirror device and straddle-type vehicle

A mirror device comprising:

• a stay attached to a vehicle body;
• a housing supported on the stay;
• a mirror mechanism including a mirror and a holding portion that holds the mirror, at least a part of the holding portion being accommodated in the housing, and the mirror mechanism being attached to the housing;
• and
• an attachment portion in which a receiving portion subjected to an attachment and detachment operation is exposed to an outside of the housing and the mirror mechanism, the attachment portion detachably attaching the mirror mechanism to the housing, wherein
• the attachment portion includes:
• a screw extending in an upper and lower direction;
• and
• the receiving portion located at one end of the screw,
• the receiving portion is located below the housing when viewed from a width direction of the vehicle body,
• the holding portion holds the mirror such that a position of the mirror to the housing is adjustable, and
• the mirror device further comprises a cover located in the housing and covering at least a part of a gap for adjusting the position between the housing and the mirror.