The present invention relates to a tilting heating apparatus in which a heating container is not lowered below the level of a tilting base when the heating container is tilted with its opening faced upward and an on-the-spot heat treatment system for a heating object. The present invention comprises a tilting base which is placed on a fixed portion and pivotal upward, an oscillating support supported by the tilting base and capable of pivotal movement, a heating apparatus consisting of a heating container attached onto the oscillating support and having a bottom with an opening and a pivotal driving mechanism for turning the heating container, a first derricking cylinder provided between the fixed portion side and the tilting base side for expansion/contraction and for displacing the tilting base to an substantially horizontal position and a rearward tilting position where the opening of the heating container is displaced upward, and a second derricking cylinder provided between the tilting base side and the oscillating support side for expansion/contraction and for displacing the oscillating support to a stationary position on the tilting base and in a forward tilting direction.