PROBLEM TO BE SOLVED: To provide a thermoplastic elastomer composition excellent in transparency, blocking resistance and molding processability, and a molded article, a film and a medical tube using the same. SOLUTION: A main chain composed of an aromatic vinyl compound-ethylene copolymer composed of an aromatic vinyl compound monomer unit, an ethylene monomer unit, and an aromatic polyene monomer unit, and an aromatic vinyl compound unit Fatty acid amide-based lubricant (B) in which the total number of carbon atoms derived from hydrocarbon groups contained in the molecule is 15 or more relative to 100 parts by mass of the cross-copolymer (A) containing the cross-chain of the polymer composed of body units. ) A thermoplastic elastomer composition comprising 0.1 part by mass or more and 4 parts by mass or less. [Selection diagram] None【課題】本発明は、透明性、耐ブロッキング性及び成形加工性に優れた熱可塑性エラストマー組成物、及びそれを用いた成形体、フィルム、医療用チューブを提供する。【解決手段】芳香族ビニル化合物単量体単位、エチレン単量体単位、芳香族ポリエン単量体単位からなる芳香族ビニル化合物－エチレン系共重合体からなる主鎖と、芳香族ビニル化合物単量体単位からなる重合体のクロス鎖を含むクロス共重合体（Ａ）１００質量部に対し、分子中に含まれる炭化水素基由来の炭素数の合計が１５個以上である脂肪酸アマイド系滑剤（Ｂ）０．１質量部以上、４質量部以下を配合してなる熱可塑性エラストマー組成物。【選択図】なし
