Aperture module and camera module including the same

A camera module comprising:

• a housing defining an inner space;
• a lens driving module accommodated in the inner space of the housing;
• and
• an aperture module disposed in front of the lens driving module to adjust a size of an incidence hole,
• wherein the aperture module comprises:
• a base defining an opening;
• a rotation plate seated on the base and configured to be rotatable about an optical axis, and including rotation plate teeth disposed along an inner circumferential surface;
• an aperture driving portion coupled to the rotation plate and configured to rotate the rotation plate in response to an input of an electrical signal;
• and
• a plurality of blades stacked in two stages and disposed inside the rotation plate, each blade including blade teeth configured to engage the rotation plate teeth, the blades being configured to move in conjunction with rotation of the rotation plate to define an incidence hole of variable size,
• wherein the plurality of blades are disposed to partially overlap neighboring blades of the other stage without overlapping with neighboring blades of the same stage.