A bicycle carrier apparatus for a vehicle may include a slide carrier configured to slide in a front-rear direction of a rear bumper beam to be drawn out and stowed, extension supports laterally extending on the slide carrier to load a bicycle, a retainer rotatably disposed on the slide carrier and configured to be coupled to a bicycle loaded on the extension supports by a clamping device to retain the bicycle, and locking devices fixed to the slide carrier, holding the retainer to be rotatable, and fixing a rotational position of the retainer when a push lever is operated.