Powder container and image forming apparatus

An image forming apparatus comprising:

• an image carrier;
• a latent-image forming unit that forms a latent image on a surface of the image carrier;
• a developing device that develops the latent image with a powdered coloring material;
• and
• a coloring-material supplying device that supplies the coloring material to the developing device,
• wherein at least one of the developing device or the coloring-material supplying device includes
• a container chamber that contains powder,
• a transporting member that transports the powder in the container chamber,
• an opening provided in a wall of the container chamber and through which the powder is discharged out of the container chamber as the transporting member transports the powder, and
• a closing member that closes a lower portion of the opening and moves vertically relative to the opening in a direction opposite to a direction of vertical movement of the opening due to tilting of the container chamber.