To provide a connection structure for a photovoltaic power generation module which is excellent in long-term heat resistance and which is excellent in low-temperature impact resistance even if the structure is reduced in wall thickness and size. There is provided a connection structure (1) for a photovoltaic power generation module which at least joins a photovoltaic power generation module to a cable for connecting to the photovoltaic power generation module, the connection structure for the photovoltaic power generation module comprising a thermoplastic resin composition having, as an index of long-term heat resistance, a relative thermal index (RTI) of tensile impact strength at a thickness of 1.5 mm of 115° C. or higher, and a Charpy impact strength at −40° C. of 6.5 kJ/m2 or more.