PURPOSE: To provide a latent heat utilizing heat/cold/ storage apparatus in which the area of heat absorbing/ dissipating surfaces is increased without increasing in size to improve a heat exchanging efficiency.

CONSTITUTION: A porous heat transfer material is brought into contact with a heat storage material 3 contained in a sealed vessel 2. Foamed metal 1 is placed in contact with the heat storage material 3 in a structure in which impregnation of the molten material 3 is prevented, and heating medium is fed to pores of the metal 1. The metal has a very large surface area to become heat absorbing/dissipating surface, and hence the heat exchanging efficiency is enhanced even if many thin pipes are not provided.