Thermoplastic elastomer composition, plug body and container

A plug body for medical containers comprising a thermoplastic elastomer composition comprising:

• 100 parts by mass of a hydrogenated block copolymer (a);
• from 10 to 50 parts by mass of a polypropylene resin (b);
• from 5 to 100 parts by mass of a polyphenylene ether resin (c);
• from 75 to 200 parts by mass of a non-aromatic softener from at least one selected from the group consisting of paraffin oil, liquid paraffin and white mineral oil (d), and
• from 1 to 150 parts by mass of an inorganic filler (e) selected from the group consisting of calcium carbonate, silica and talc,
• wherein
• the hydrogenated block copolymer (a) contains a hydrogenated block copolymer (a-1) obtained by hydrogenation, the hydrogenated block copolymer (a-1) comprising at least one polymer block A1 comprising a styrene monomer unit, and at least one polymer block B1 comprising conjugated diene compound monomer unit,
• a weight-average molecular weight of the hydrogenated block copolymer (a-1) is from 100,000 to 550,000, and
• a content of all styrene monomer units in the hydrogenated block copolymer (a-1) is more than 20% by mass and 50% by mass or less;
• and
• the inorganic filler (e) is surface-treated with at least one member selected from the group consisting of a fatty acid and, a silane coupling agent.