Patent ID: 8797762

Claim:
A tire inside information acquiring device attached inside a tire-wheel assembly and configured to acquire tire inside information, which is information on the inside of the tire, the tire inside information acquiring device comprising: an electronic circuit unit; a housing body configured to house the electronic circuit unit; and a sealing mean configured to hermetically seal the housing body with no gaps, a substrate on which a component constituting the tire inside information acquiring device and the housing body are disposed, wherein the housing body is formed of a nonmetallic inorganic material, and a gap is formed between the housing body and the substrate˜a substrate on which the housing body and a component constituting the tire inside information acquiring device are disposed; and an outer housing body configured to house the housing body and the substrate; wherein the outer housing body is formed of a nonmetallic material, the housing body is disposed on one surface of the substrate, the component is disposed on another surface of the substrate, and a sealant is filled in a substrate housing portion with the substrate housed in the outer housing body in a way that the one surface of the substrate is positioned closer to an opening surface; wherein the housing body is interposed between the gap and the sealant.