Heat insulating structure using aerogel

Heat insulating structure comprising:

• an aerogel layer including aerogel particles, adhesive, and fibers;
• a retainer which is provided to at least one face of the aerogel layer and includes fiber materials and binder resin, and
• a fillet part situated at a boundary between the aerogel layer and the retainer, wherein:
• parts of some of the fiber materials project from the retainer into the aerogel layer, and wherein each of the fibers of the aerogel layer is part of one of the fiber materials included in the retainer,
• the parts of the fiber materials projecting from the retainer into the aerogel layer include
• a fiber material including a looped middle portion which is in the aerogel layer and
• a fiber material including an unlooped end which is in the aerogel layer,
• a projection length that the looped middle portion projects into the aerogel layer is from 5 to 50% of the thickness of the aerogel layer,
• the retainer is larger than the aerogel layer in a plan view,
• a periphery of the retainer extends horizontally beyond a periphery of the aerogel layer,
• the fillet part covers a periphery of the boundary between the aerogel layer and the retainer,
• a rising angle that is defined as a tilt angle of the fillet part measured from a surface of the retainer is equal to or less than 90 degrees, and
• a rising angle that is defined as a tilt angle of the fillet part measured from a surface of the aerogel layer is equal to or less than 90 degrees.