To regenerate used solid wax moldings with high thermal efficiency, to facilitate housing of the wax moldings, taking out of fluid wax and washing of filter means and to efficiently carry out the regeneration work of the wax.

The used solid wax 1 is melted by hot air which is forcibly circulated between the inside of spaces of a cap 22 and a case 20 by a fan 40. The case 20 houses the solid wax moldings to be regenerated above the filters 32 and 34 and holds the regenerated fluid wax below the filters 32 and 34. The regenerated fluid wax is taken out of a supply conduit 56 through an aperture of the case 20. An inclined base surface 20B of an inverted conical shape of the case 20 facilitates the collection and recovery of the wax and has a function to hold the plural filters 32 and 34 apart a spacing.