Plasticizing Device, Three Dimensional Molding Device, And Injection Molding Device

A plasticizing device comprising:

• a material storage section that is configured to store a material and that is configured to discharge the material from an input port;
• a plasticizing section that includes a screw and a case accommodating the screw and in which is formed a supply port communicating with the input port, and that is configured to plasticize the material to generate a plasticized material;
• a connecting member that includes a transparent member and that is configured to bring the input port and the supply port into communication with each other;
• and
• a material sensor that includes a light emitting section that emits light toward the supply port via the transparent member and a light receiving section that receives reflected light of the light and that is configured to detect a remaining amount of the material, wherein
• the connecting member includes a material collision section against which the material input from the input port collides and
• the material collision section is provided between the input port and the transparent member.