Provided is an opening/closing apparatus for a vehicle capable of protecting a cable configured to open and close an opening/closing body even when a large external force is applied to the opening/closing body. A cross-sectional shape of a cable holding groove in a direction crossing a longitudinal direction of a cable guide is an arc shape configured to be in surface contact with a closing-side cable and an opening-side cable. Accordingly, a pressing force applied to the closing-side cable and the opening-side cable can be dispersed in a wide range of the closing-side cable and the opening-side cable rather than only in one part.