To provide a sintering method for a hard alloy, which prevents adjacent pressed bodies from sintering each other when sintered.

The sintering method for the hard alloy, which sinters pressed bodies 1 of the hard alloy material mounted on a sintering tray 2, includes setting a material 3 containing (C6H10O5)n onto at least one part of the surface of the press body 1 before sintering it. The material 3 containing (C6H10O5)n placed between the press bodies 1 works as a release agent to prevent the pressed bodies 1 coupled each other when sintered.