Movable Terminal Unit Assembly Structure, Push Button Switch having the Same, Controller having the Push Button Switch, and Movable Terminal Unit Assembly Method

An assembly method of a movable terminal unit, said movable terminal unit including a movable terminal, a biasing member that biases said movable terminal, and a pressing member of said biasing member, said assembly method is for housing and assembling said movable terminal unit in a housing portion that is open at its one end and to its side,

• said assembly method comprising:
• inserting said movable terminal into said housing portion from a one-end opening or a side opening of said housing portion and disposing said movable terminal at its other end of said housing portion;
• inserting said biasing member into said housing portion from said one-end opening of said housing portion and making said biasing member contact with said movable terminal;
• disposing said pressing member at said one-end opening of said housing portion and making said pressing member contact with said biasing member to press and compressive-deform said biasing member;
• and
• sliding said pressing member circumferentially along a circular inner circumferential surface of said one-end opening of said housing portion, whereby said pressing member is held at said one-end opening of said housing portion through an engagement portion that is provided at said inner circumferential surface of said one-end opening of said housing portion and at an outer circumferential surface of said pressing member that corresponds to said inner circumferential surface of said one-end opening of said housing portion.