Seamless belt and method for manufacturing seamless belt

The invention provides a seamless belt capable of further improving the strength of a joint part and a method for manufacturing the seamless belt. The seamless belt (10) includes a core layer (12), a first intermediate layer (14) formed of a thermoplastic resin and provided on one surface of the core layer (12), a first surface layer (18) provided on the surface of the first intermediate layer (14), and a joint portion (15) to which a first end portion (22) and a second end portion (24) having mutually complementary shapes are joined, the seamless belt (10) further comprises a reinforcing sheet (26) embedded in the first intermediate layer (14) between the first end (22) and the second end (24), the reinforcing sheet (26) having a gap (28) penetrating in the thickness direction. The first intermediate layer (14) has a surface-side intermediate section (27) disposed on the first surface layer (18) side of the reinforcing sheet (26), a core-side intermediate section (29) disposed on the core layer (12) side of