A thermoplastic polymer composition comprising: an aromatic vinyl-based block copolymer (a-1) having a number average molecular weight of 30,000 to 200,000, the aromatic vinyl based block copolymer (a-1) containing a polymer block F having a number average molecular weight of 1,000 to 50,000 and containing a structural unit derived from an aromatic vinyl-based monomer as a main component; and a polymer block G containing a polymer block g1, which is a polymer block having a number average molecular weight of 1,000 to 30,000 and in which the content of a 1,4-bond structural unit derived from a conjugated diene monomer that constitutes the polymer block is less than 30 mol%, and a polymer block g2, which is a polymer block having a number average molecular weight of 25,000 to 190,000 and in which the content of a 1,4-bond structural unit derived from a conjugated diene monomer that constitutes the polymer block is 30 mol% or more, and the aromatic vinyl-based block copolymer (a-1) contains at least one (F-g1-g2) structure; an acrylic polymer (a-2); an olefin-based polymer containing polar groups (a-3); and a softening agent (a-4), at the proportions satisfying the following Expressions to: 0.05 ≤ W a − 2 / W a − 1 ≤ 9 0.15 ≤ W a − 3 / W a − 1 + W a − 2 + W a − 3 + W a − 4 ≤ 0.9 and 0 ≤ W a − 4 / W a − 1 + W a − 2 + W a − 3 + W a − 4 ≤ 0.5 wherein W (a-1), W (a-2), W (a-3) and W (a-4) represent the contents (on a mass basis) of the aromatic vinyl-based block copolymer (a-1), acrylic polymer (a-2), olefin-based polymer containing polar groups (a-3) and softening agent (a-4), respectively, in the thermoplastic polymer composition. an aromatic vinyl-based block copolymer (a-1) having a number average molecular weight of 30,000 to 200,000, the aromatic vinyl based block copolymer (a-1) containing a polymer block F having a number average molecular weight of 1,000 to 50,000 and containing a structural unit derived from an aromatic vinyl-based monomer as a main component; and a polymer block G containing a polymer block g1, which is a polymer block having a number average molecular weight of 1,000 to 30,000 and in which the content of a 1,4-bond structural unit derived from a conjugated diene monomer that constitutes the polymer block is less than 30 mol%, and a polymer block g2, which is a polymer block having a number average molecular weight of 25,000 to 190,000 and in which the content of a 1,4-bond structural unit derived from a conjugated diene monomer that constitutes the polymer block is 30 mol% or more, and the aromatic vinyl-based block copolymer (a-1) contains at least one (F-g1-g2) structure; an acrylic polymer (a-2); an olefin-based polymer containing polar groups (a-3); and a softening agent (a-4), at the proportions satisfying the following Expressions to: 0.05 ≤ W a − 2 / W a − 1 ≤ 9 0.15 ≤ W a − 3 / W a − 1 + W a − 2 + W a − 3 + W a − 4 ≤ 0.9 and 0 ≤ W a − 4 / W a − 1 + W a − 2 + W a − 3 + W a − 4 ≤ 0.5 wherein W (a-1), W (a-2), W (a-3) and W (a-4) represent the contents (on a mass basis) of the aromatic vinyl-based block copolymer (a-1), acrylic polymer (a-2), olefin-based polymer containing polar groups (a-3) and softening agent (a-4), respectively, in the thermoplastic polymer composition.