Patent ID: 8258413

Claim:
A load detection device for a vehicle seat mounted between a floor side mounting mechanism and a seat side mounting mechanism and measuring a load applied by an occupant seated on the vehicle seat, comprising: a shaft member adapted to be fixed to one of the floor side mounting mechanism and the seat side mounting mechanism; a strain generating member fixed to the shaft member and including a hole into which the shaft member is press-fitted for fixing the strain generating member to the shaft member, the hole possessing an inner diameter; a strain gauge attached to the strain generating member; the shaft member of which surface hardness is specified to be lower than a surface hardness of the hole of the strain generating member and including a scraping projecting portion possessing a maximum external diameter larger than the inner diameter of the hole, the scraping projecting portion also possessing a minimum external diameter different from the maximum external diameter and smaller than the inner diameter of the hole, the scraping projecting portion being scraped off by the hole when the shaft member is press-fitted into the hole; and an interspace formed between the strain generating member and the shaft member and positioned next to the scraping projecting portion.