A mechanical construction toy for children of preschool age which can be assembled to form a robot. The construction toy has several parts which may be arranged in order to construct or build the robot. Three of the parts form a plane of carriage upon and about which the weight and moment of the toy rest and travel. The various parts are engageable with one another to provide several slip-type joints which permit the toy to take a variety of shapes or poses. The toy, when constructed, takes the shape of a robot and is an object of amusement as well as an education to the child.