To provide a foam combustion apparatus realizing horizontal combustion and high combustion efficiency.

First, at least two sheets of porous elements are bonded together with a liquid diffusion sheet sandwiched therebetween and a liquid fuel is supplied to the sheet at appropriate positions. Second, at least two sheets of porous elements are bonded together, a groove having a predetermined pattern is formed on one or both of the inside surfaces of the porous elements to be bonded and a liquid fuel supply tube having minute holes thereon at appropriate intervals is arranged therein.