Projector

The invention relates to a projector which comprises a lens module group and a focusing key. The lens module group comprises an outer lens barrel, an inner lens barrel and a projecting lens which are sequentially sleeved. A groove at a certain angle with an optical axis of the lens module group is arranged on the side wall of the outer lens barrel. A guide groove corresponding to the groove is arranged on the outer wall of the inner lens barrel along the axial direction thereof. The projecting lens extends along the radial direction thereof to form a guide pole, and the guide pole penetrates through the guide groove and the groove. A cam pin is extended out from the focusing key close to one side of the lens module group. The lens module group is provided with a cam groove engaged with the cam pin. When the focusing key is pushed along the direction of an optical axis, the projecting lens can move along the direction of the optical axis. The cam groove is arranged on the lens module group of the projector, an