PROBLEM TO BE SOLVED: To provide a fixed amount unloading container which can be used by pushing out a fixed amount of contents by simple operation.SOLUTION: A fixed amount unloading container 1 includes: a cylinder 2 a piston 3 which forms a filling space Sof contents M between an ejecting port 1a and the piston a rod 4 which moves the piston 3 to the ejecting port 1a a sheath 5 for housing the rod 4 and an operational member 6 which can slide along the sheath 5. The rod 4 has a plurality of inclined teeth 4g in respective opposing positions with an axis line O in between. The operational member 6 includes: a cylindrical body part 7a through which the rod 4 penetrates two arm parts 7b which can be deformed and restored two inclined tooth parts 7d which are respectively provided on tip ends of the arm parts 7b and have a plurality of inclined teeth 7g that mesh with the inclined teeth 4g of the rod 4 only in a push-in direction of the operational member 6 and are disengaged by retracting the operational member 6 and two deformable and restorable connecting belts 7e which connect the inclined tooth parts 7d annularly around the axis line O.
