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 as the unit (a), a linear aliphatic diamino unit as the unit (b), a unit (c) and a unit (b) having a predetermined structure, respectively. A resin containing at least one and a trivalent unit (e) 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）として直鎖状脂肪族ジカルボニル単位と、単位（ｂ）として直鎖状脂肪族ジアミノ単位と、それぞれ所定の構造の単位（ｃ）と単位（ｂ）との少なくとも１つと、３価の単位（ｅ）とを含む樹脂を用いる。
