Provided is a vehicular holding device that, in an ON state, holds a vehicle component in a state where displacement of the vehicle component in an axial direction is restrained, and that, in an OFF state, holds the vehicle component in a state where displacement of the vehicle component in the axial direction is possible. The vehicular holding device is equipped with at least one engagement part,a cam mechanism, and an axial direction restraining part. The at least one engagement part is at a position at which the engagement part engages with a to-be-engaged part in the ON state, and is at aposition at which the engagement part is separated from the to-be-engaged part in the OFF state. The cam mechanism displaces the at least one engagement part from the OFF-state position to the ON-state position. The axial direction restraining part receives an axial-direction force that acts on the at least one engagement part.