A developer supply container and a developer supplying system include a feeding portion 2c for feeding a developer T in a developer accommodating portion 2 toward a developer discharging portion 4c in accordance with rotation, a gear portion 2d for receiving a rotational force for rotating a feeding portion 2c, a pump portion 3a provided to act at least toward the developer discharging portion 4c and having a volume with changes with reciprocation, a drive converting portion for converting the rotational force inputted to the gear portion 2d into a force for operating the pump portion 3a, a reciprocating member 3b provided at the drive converting portion and reciprocable to convert to the rotational force into a force for operating the pump portion 3a, a rotation regulating portion 3f for regulating movement in a direction crossing with a direction in which the reciprocating member 3b reciprocates, an elastically deformable urging portion 3g1, 3g2, provided on the reciprocating member 3b, for urging the reciprocating member 3b toward the rotation regulating portion 3f.