Thermoplastic elastomer composition, extrusion molded article, and medical tube

A thermoplastic elastomer composition, comprising:

• a hydrogenated block copolymer component comprising (A) a high-MFR hydrogenated block copolymer of a structure P1-Q1-P1, (a1) a low-MFR hydrogenated block copolymer of a structure P2-Q2-P2, and optionally a second low-MFR hydrogenated block copolymer (a2) of a structure P3-Q3-P3;
• and
• a propylene polymer (B),
• wherein each hydrogenated block copolymer is a hydrogenated product of a block copolymer comprising respective first and second polymer blocks, P1, P2, and P3, comprising at least 50 mol % of an aromatic vinyl compound unit and a respective polymer block, Q1, Q2, and Q3, comprising at least 50 mol % of a conjugated diene,
• wherein a total content of the aromatic vinyl compound unit in all of the hydrogenated block copolymers is from 8 to less than 20 mass %,
• wherein the high-MFR hydrogenated block copolymer having a melt flow rate (MFR) of 40 to 300 g/10 min as measured in accordance with ISO 1133 at 230° C. under a load of 2.16 kg, and
• wherein the first low-MFR hydrogenated block copolymer having a melt flow rate (MFR) of 0.5 to 39 g/10 min as measured in accordance with ISO 1133 at 230° C. under a load of 2.16 kg.