Method for producing thermoplastic elastomer composition

A method for producing a thermoplastic elastomer composition comprising using a twin screw kneader to melt-knead a thermoplastic resin and an elastomer;

• the twin screw kneader having at least two raw material inlets including a first raw material inlet and a second raw material inlet provided at a position separated by 15D to 38D on a downstream side from the first raw material inlet, where D is a cylinder inside diameter of the twin screw kneader;
• the same elastomer being fed in a divided manner from the first and second raw material inlets;
• a proportion of the elastomer fed from the second inlet being from 10 to 60 vol % of a total amount of the elastomer;
• and
• the elastomer being melt-kneaded in a kneading zone having a length of from 0.5D to 20D in a cylinder axis direction of the twin screw kneader, at least one kneading zone being respectively provided between the first and second raw material inlets and on a downstream side from the second raw material inlet;
• wherein a temperature (A) of the elastomer fed from the second raw material inlet is at least 100° C. lower than a resin temperature (T) of a cylinder tip discharge port at the time of kneading.