PURPOSE: To obtain the amorphous alloy which is improved in moldability by utilizing thermal stability and a supercooling liquid state.

CONSTITUTION: The molten metal for obtaining the alloy having such characteristics as to exhibit glass transition phenomenon at the true crystallization temp. Tx or below and to generate at least one time of the primary heat evolution phenomenon to generate partial crystallization then the secondary heat evolution phenomenon to cause the crystallization of the entire part at the true crystallization temp. Tx or above in the state of the alloy produced at a cooling rate for obtaining the amorphous single phase structure is used. This molten metal is subjected to a cooling treatment at the cooling rate lower than the above-mentioned cooling rate, by which the heat evolution phenomenon corresponding to the above-mentioned primary heat evolution phenomenon is generated in this cooling treatment stage and the crystal grains are formed partly. The amorphous alloy (line a2) with which the apparent crystallization temp. T rather than the true crystallization temp. Tx of the amorphous alloy (line a1) having the amorphous single phase structure is shifted to the high temp. side is thus obtd.