Foot arch support device

A foot arch support device adapted to be connected to a bottom of a shoe, the shoe having a heel portion, a toe portion, and an arch portion that is between the heel portion and the toe portion, said foot arch support device comprising:

• a base seat including
• a first base plate, and
• a second base plate that is disposed under said first base plate, and that is adapted to be adjacent to the heel portion of the shoe, said first base plate having a top surface that is opposite to said second base plate;
• a movable unit including a movable plate that is connected to said first base plate, that has an abutment surface facing said top surface of said first base plate, and that is movable relative to said first base plate between a high curvature position, where said abutment surface is away from said top surface of said first base plate, and a low curvature position, where said abutment surface abuts against said top surface of said first base plate;
• a heel unit including a high heel member and a low heel member, a selected one of said high heel member and said low heel member being removably coupled to a bottom of said base seat, and having a heel part, and a support part extending from a top end of said heel part and having a top end face,
• when said low heel member is coupled to said bottom of said base seat, said movable plate of said movable unit is at the low curvature position,
• when said high heel member is coupled to said bottom of said base seat, said top end face of said support part of said high heel member abuts against said abutment surface of said movable plate, and said movable plate is pushed by said support part of said high heel member to the high curvature position;
• and
• an actuating unit disposed on said base seat, adapted to be adjacent to the heel portion of the shoe, and operable for permitting removal of the selected one of said high heel member and said low heel member from the bottom of said base seat.