Clasp, strap, and timepiece

A clasp that couples a first strap and a second strap, the clasp comprising:

• a coupling member coupled to a first strap side and including an engaged portion;
• and
• a clasp main body coupled to a second strap side, wherein
• the clasp main body includes
• an engagement member configured to move to an engagement position where the engagement member is configured to engage with the engaged portion and a release position where the engagement member is configured to release an engagement with the engaged portion,
• an operation member configured to move the engagement member from the engagement position to the release position, and
• a lock device configured to move to an operation restriction position where an operation of the operation member is restricted and an operation permission position where the operation of the operation member is permitted,
• in a state in which the lock device is at the operation restriction position or the operation permission position, the engagement member is configured to be engaged with the engaged portion without operating the operation member in a state in which the engagement member is not engaged with the engaged portion,
• the engagement is released by moving the engagement member to the release position by the operation member in a state in which the engagement member is engaged with the engaged portion,
• when the lock device is moved to the operation restriction position, the engagement member is restricted from moving to the release position by the operation member, and
• the operation member includes
• a projection portion configured to protrude toward the engagement member side.