In a solid state, a polyamide resin having an excellent balance of mechanical properties such as breaking strength and elongation at break, a molded body containing the polyamide resin, a laminate comprising a film or sheet containing the polyamide resin, and the aforementioned To provide a molded device, a medical device including at least one of the above-described laminates, and a method for producing the above-described polyamide-based resin. As the polyamide-based resin, a linear aliphatic dicarbonyl unit having 10 to 20 carbon atoms as the unit (a), and a linear aliphatic diamino unit having 10 to 20 carbon atoms as the unit (b), A resin containing an aliphatic unit having a predetermined structure other than the unit (a) and the unit (b) is used.固体状態において、破断強度や破断伸び等の機械的特性のバランスに優れるポリアミド系樹脂と、当該ポリアミド系樹脂を含む成形体と、当該ポリアミド系樹脂を含むフィルム又はシートを備える積層体と、前述の成形体、及び前述の積層体の少なくとも１つを備える医療機器と、前述のポリアミド系樹脂の製造方法とを提供すること。 ポリアミド系樹脂として、単位（ａ）として炭素原子数１０以上２０以下の直鎖状脂肪族ジカルボニル単位と、単位（ｂ）として炭素原子数１０以上２０以下の直鎖状脂肪族ジアミノ単位と、単位（ａ）及び単位（ｂ）以外の所定の構造の脂肪族単位と、を含む樹脂を用いる。
