1. An injection unit of an injection molding machine which moves an injection screw in a longitudinal direction, the injection
a first member which is disposed to be movable in the longitudinal direction and to which the injection screw is attached;
a second member capable of being connected to the first member at the back thereof by a connection member; and
drive means attached to the second member and capable of causing the second member to move the first member in the longitudinal
wherein the connection between the first and second members by the connection member is removable, and the first and second
members are supported by different support members when the connection between the first and second members by the connection
member is removed.