Holding device

A holding device in which a holding mechanism having a holding part for holding a held object is supported on a device main body so as to slidably project and retract, the holding device comprising:

• a lock part mounted on the holding mechanism and configured to lock the holding mechanism at an arbitrary projected position,
• the device main body being provided with a to-be-engaged body including a plurality of to-be-engaged parts arranged in a projecting and retracting direction of the holding mechanism,
• wherein the lock part includes
• a first rotary body pivotally supported on the holding mechanism and configured to rotate by application of an erecting operation, the erecting operation being operation to erect the holding part,
• a second rotary body configured to rotate by a force directly or indirectly applied from the first rotary body by the rotation of the first rotary body, and
• an engagement part configured to move, by the rotation of the second rotary body, between an engaged position at which the engagement part is engaged to the to-be-engaged part so as to be engaged to one of the plurality of to-be-engaged parts of the to-be-engaged body of the device main body and a disengaged position in which the engagement part is separated from the to-be-engaged part to be disengaged, wherein,
• the lock part locks the holding mechanism with the engagement part being moved to the engaged position and unlocks the holding mechanism with the engagement part being moved to the disengaged position, and
• the engagement part moves to the engaged position by the erecting operation.