This projector comprises a source lamp, a lamp storage portion, storing the source lamp therein, including an air discharge opening for discharging internal air from the lamp storage portion and a netlike member so arranged as to cover the outer side of the air discharge opening of the lamp storage portion for inhibiting fragments of the source lamp from being discharged outward from the lamp storage portion through the air discharge opening when the source lamp is broken. The lamp storage portion further includes a protrusion provided on the outer side surface close to the air discharge opening to protrude in a direction intersecting with the extensional direction of the netlike member with a function of inhibiting the fragments of the source lamp from passing through a clearance between the lamp storage portion and the netlike member.