To provide a light shielding and heat insulating block enclosing net usable for various things such as a roof floor, roof, wall, window, or the like of an existing building and a house for agriculture, a fish preserve for fishery, or the like.

Pumice, a foamed resin, or the like to be a heat insulating member is covered entirely or on a surface exposed to sunlight with an aluminum material such as aluminum foil or an aluminum deposition film to be a light shielding member, to be turned to a light shielding and heat insulating block. The block is individually enclosed one by one by a net and is connected to attain the light shielding and heat insulating block enclosing net. Thus, various things such as a roof floor, roof, wall, window, or the like of an existing building and a house for agriculture or the like are light-shielded and heat-insulated. Further, by making the specific gravity of the light shielding and heat insulating block to be equal to or smaller than 1, the light shielding and heat insulating block enclosing net can be floated on a sea surface to perform light shielding and heat insulation in the culture of fish and seaweeds.