The present invention is aimed at providing an advancing and retreating movement apparatus. The apparatus can make a locking member move to a locking position regardless of the axial position of an advancing and retreating member, and even though the locking member is located at the locking position, can also make the advancing and retreating member move towards a retreating holding position. The advancing and retreating movement apparatus (1) comprises a housing (2), an advancing and retreating member (3), a force applying member, a cam mechanism (C), and a locking member (5); the end portion of the advancing and retreating member (3) at a retreating direction (D2) side comprises a protruding portion (3a) axially protruding towards the retreating direction (D2), and a recess portion (3b) formed in the shape of the Chinese character "凹" with respect to the protruding portion (3a); the protruding portion (3a) comprises an abutment portion (CT) that can abut against an abutted portion (5a) of the locking member (5) located at the locking position; when the advancing and retreating member (3) reaches a return position from an advancing holding position, the abutment portion (CT) is located at a position that does not correspond to the abutted portion (5a) in an axial direction; and when the advancing and retreating member (3) is held at the retreating holding position, the abutment portion (CT) is located at a position that corresponds to the abutted portion (5a) in the axial direction.