The thermoplastic elastomer composition of this invention includes 2 through 14 mass % of PP; 19 through 35 mass % of PB-1; and 30 through 52 mass % of olefin-based rubber, and a weight ratio of PB-1/(PP+PB-1) is 56 through 90% and a weight ratio of PB-1/(PP+(PB-1)+olefin-based rubber) is 25 through 47%.