[Problem] To provide a thermoplastic resin composition for use in an organ model, wherein said composition has a softness closer to that of an organ, a high mechanical strength, and a texture close to an organ, exhibits excellent durability, and can be handled easily. [Solution] A resin composition for an organ model, said composition containing, as component (A), 100 parts by mass of a hydrogenated block copolymer having an MFR (measured at a temperature of 230° C. and a load of 2.16 kg) of 1 g/10 min. or less, and an oil as component (B). Moreover, the composition may also contain a cross copolymer as component (C), a polypropylene resin as component (D), and a filler as component (E).