To provide a heating furnace having a moving hearth in which skid rails acting as composing material for a movable hearth and a fixed hearth can be endured against a long-term usage without showing any local wearing, an amount of usage of the skid rails is small and a loss of heat removed through a water-cooled pipe is low.

In a heating furnace having a movable hearth in which at movable hearth and a fixed hearth provided with water-cooled pipes having skid rails for supporting material are applied as an inter-furnace transporting device and the materials supported on the fixed hearth are transported intermittently at a predetermined transporting stroke S under an upward or downward motion and a forward or rearward motion of the movable hearth and heated, the skid rails 16 having a length L capable of supporting one piece of material W are fixed to a water-cooled pipe 15 in a fixing pitch P in a furnace length direction which is equal to the transporting stroke S so as to cause the material W to be supported within a range of the length L of the skid rails 16.