Material feeding device, injection molding device, and three-dimensional modeling device

A material feeding device comprising:

• a hopper which has an opening part, and is configured to contain a material;
• and
• a coupling member configured so that the hopper is detachably attached to the coupling member,
• wherein the coupling member includes
• a slide surface having a first area where a feed hole is disposed,
• a first member configured to make a sliding displacement on the slide surface, and
• a detachably attaching part which is disposed in a second area extending along a direction in which the first area extends, and with which the hopper is detachably attached to the coupling member,
• wherein, in the attached state in which the hopper is attached to the coupling member,
• there is adopted a configuration in which when the hopper is located in the first area, the first member makes a sliding displacement to a third area different from the first area to thereby take a communicated state in which the opening part and the feed hole are communicated with each other, and
• there is adopted a configuration in which when the hopper is located in the second area, the first member makes a sliding displacement to the first area to thereby take a non-communicated state in which the first member covers the feed hole, and
• wherein the non-communicated state is taken at least when the hopper is detached from the coupling member via the detachably attaching part.