Abstract: A collapsible trailer having a platform made of two longitudinal sections which folds against each other along its central longitudinal axis. Two lateral panels are hingely mounted on each side of the platform to fold over the platform. Removable front and rear panels maintain the lateral panels in their upright position and prevent the platform from folding. Flanges along the longitudinal axis of the platform abut against each other to keep the platform flat in its load carrying position. Beams along the lateral sides of the platform also abut against beams secured to the lower edge of the lateral panels to keep the panels from collapsing outwardly. A towing bar is hingely mounted to the front of the platform for collapsing against the latter. A wheel is resiliently mounted under each lateral panel.