The invention relates to a collapsible rocking device for rocking a pushchair provided with a frame and wheels, such a pushchair provided therewith and method therefor. The rocking device according to the invention comprises a housing provided with two guides and wheel holders which are arranged movably relative thereto and which are configured to receive a wheel of the pushchair to be rocked; at least one length-adjustable arm configured to adjust the mutual distance between the wheel holders; a number of collapsing mechanisms arranged in or on the guides, such that the rocking device can be moved from a position of use into a storage or transport position, and vice versa; at least one drive configured to drive the wheel holders such that the wheel holders make a translating movement in the direction of travel of the pushchair; and a controller configured to control the drive.