PURPOSE: A front door is provided to prevent condensation on a door plate surface in winter time and to prevent heat loss by cutting off the heat transmission between a reinforcing metal member and an indoor metal door plate. CONSTITUTION: A front door comprises a reinforcing metal member(104). The reinforcing metal member has an inner space surrounded with an indoor steel plate(102) and an outdoor steel plate(103) at the edge of an entrance gate facing with a door frame(200). The reinforcing metal is made of a bendable steel sheet. The reinforcing metal member is expanded toward the door frame and forms a blade(110).
