The present disclosure provides a replaceable pin system for an in-vehicle component. The replaceable pin system including a holding member, a pin member. The pin member includes a body, a protruding portion, and a first engaging portion. The holding member includes a base, a retainer, and a second engaging portion. The retainer is spaced away from the base in the protruding direction to define a rotation space together with the base. The two ends are interposed between the retainer and the base when the body is rotated to the second orientation. The second engaging portion is formed in the holding member at a position where the first engaging portion is positioned when the body is rotated to the second orientation, whereby the first engaging portion engages with the second engaging portion when the body is at the second orientation.