It possesses high heat resistance at the high-molecular quantity, the poly- lactic acid type resin which possesses amide connection in the molecular chain, it designates the production method and that its use is offered as purpose. The ratio where the terminal functional group is the carboxyl group exceeds 50%, poly- (L lactic acid) and the ratio where the terminal functional group is the carboxyl group exceeds 50%, poly- lactic acid type resin (i) the constitution unit which is obtained poly- (D lactic acid) by reacting the blend and the poriisoshianeto chemical compound which are contained at least, the below-mentioned formula is displayed with (1) is included. (Formula in (1), R being the poriisoshianeto residue, carbon count the aliphatic hydrocarbon radical of 1 - 20, the carbon count the carbon count displays the hydrocarbon radical 6 to which includes the hydrocarbon radical or aromatic ring of 3 which includes fat ring structure - 20 - 20.)
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