Connection structure and wearable device

A connection structure comprising:

• a connection pin
• that includes a first part and a second part between which a step is formed, the second part being thicker than the first part, and
• that connects a first connection target and a second connection target by being inserted in an insertion hole of the first connection target and an insertion hole of the second connection target;
• a pin locker
• that is movable in a moving direction in a recess formed in one of the first connection target and the second connection target, the moving direction being different from a direction in which the through hole of the one of the first connection target and the second connection target extends,
• that has a pin engaging part that is configured to engage with the step of the connection pin, and
• that has a pin insertion part having a size that allows the connection pin to pass through, a part of an edge of the pin insertion part being the pin engaging part;
• and
• a bias that biases the pin locker in a single direction along the moving direction,
• wherein:
• one of the recess and the pin locker has a first abutting part, and another of the recess and the pin locker has a first abutted part to be abutted by the first abutting part,
• when the pin locker is at a specific position in the moving direction and when the first abutting part abuts the first abutted part, at least either an orientation of the pin insertion part with respect to the insertion hole or a position of the pin insertion part on a plane perpendicular to the moving direction is limited such that the second part of the connection pin being inserted in the insertion hole is allowed to pass through the pin insertion part,
• the pin locker is movable in the recess in the moving direction between a first position and a second position, the second position being the specific position different from the first position, includes a second abutting part that abuts an inside wall of the recess when the pin locker is at the second position, the inside wall crossing the moving direction,
• the bias is a helical compression spring, and
• the second abutting part is disposed inside the helical compression spring.