To provide a filling pump improved in productivity and durability and used for a filling device for sausages, etc.

In a filling pump in which one end of a rotation shaft 22 for a rotary 23 disposed in a housing 21 is supported with a bearing and which is used for a charging device for sausages, etc., a shaft member 27 connected to the other end of the rotation shaft 22 in a fitting connection structure is disposed, and the shaft member 27 is supported on a rolling bearing 33. The rotation shaft 32 is further supported in a central structure based on the rotary 23.