Developer detection device capable of detecting amount of developer in developer accommodating container

A developer accommodating device being detachably/attachably fixed to an image forming apparatus including a light-emitting unit and a light-receiving unit for receiving light emitted from the light-emitting unit, the developer accommodating device comprising:

• an accommodating container storing a developer;
• a stirring member disposed in the accommodating container, the stirring member temporarily stopping rotating at a rotation position corresponding to a developer upper surface position of developer stored in an accommodating container;
• and
• a detection plate including a light-blocking section and a light-passing section, the detection plate being joined to the stirring member;
• wherein when the stirring member is at a lower position in the accommodating container with respect to the light-emitting unit and the light-receiving unit, the light-passing section is positioned on an optical path from the light-emitting unit to the light-receiving unit.