The invention provides a surgical device for endoscopic surgery having the function of temporarily storing liquid (a first function), the function of keeping a physical space for surgery and a sufficient endoscopic field (a second function), and the function of protecting organs (a third function), and an insertion device for inserting the surgical device into a body.[Solving Means]The surgical device for endoscopic surgery is an inter-organ spacer (10) including liquid holding means (1) formed of a porous soft material having the ability to temporarily store liquid and the ability to retain its shape. The insertion device for inserting the inter-organ spacer into a body includes a tubular holder capable of holding the inter-organ spacer for endoscopic surgery.