A platform for a pushchair includes a frame with at least one wheel, and a device for reversibly connecting to the frame of a pushchair supported by the frame. The device can be attached between left and right uprights of the pushchair, belonging to left and right rear portions of the pushchair frame, parallel to and facing each other, with respective and second female housings. The device includes: first and second male elements moving relative to the frame between a connection position and a disconnection position; and a mechanism for activating the first and second male elements, this mechanism being suitable for: jointly moving, through the action of only one hand of a user, the first and second male elements from their connection position to their disconnection position; and automatically returning the first and second male elements from their disconnection position to their connection position.