Solar light reflecting plate and light collecting/heat collecting device

A solar light reflecting plate used for a light condensing and heat collecting device which includes a solar light reflecting plate that reflects and condenses solar light and a heat collecting tube that receives the solar light condensed by the solar light reflecting plate and is heated by the condensed solar light, wherein

• (1) the solar light reflecting plate comprises at least a rolled substrate,
• (2) a surface roughness of a solar light reflecting surface that is an outermost surface and reflects solar light is 0.02 μm to 1.0 μm in terms of arithmetic mean roughness Ra, and
• (3) the solar light reflecting plate is disposed so that an angle between a rolling direction of the substrate and a longitudinal direction of the heat collecting tube is 80° to 100°.

A light condensing and heat collecting device including a solar light reflecting plate that reflects and condenses solar light and a heat collecting tube that receives the solar light condensed by the solar light reflecting plate and is heated by the condensed solar light, wherein

• (1) the solar light reflecting plate comprises at least a rolled substrate,
• (2) in the solar light reflecting plate, surface roughness of a solar light reflecting surface that is an outermost surface and that reflects the solar light is 0.02 μm to 1.0 μm in terms of arithmetic mean roughness Ra, and
• (3) the solar light reflecting plate is disposed so that an angle between a rolling direction of the substrate and a longitudinal direction of the heat collecting tube is 80° to 100°.