A method for manufacturing a SiC semiconductor substrate, the method comprising:
- a first heating process of heating a heat treatment space accommodating a SiC semiconductor substrate and a release and reception body that transports atoms to and from the SiC semiconductor substrate in a manner that a temperature gradient is formed between the SiC semiconductor substrate and the release and reception body;
- a second heating process of reversing the temperature gradient between the SiC semiconductor substrate and the release and reception body and performing heating;
- and,
- wherein the first heating process and the second heating process comprising heating the SiC semiconductor substrate in a main container made of a material containing polycrystalline SiC.