Patent ID: 7748276

Claim:
A method for manufacturing a pressure sensor that is adapted to measure pressure of a fluid, the pressure sensor comprising: a pressure detector having a bottomed cylindrical member with a bottom including a thin-wall portion and a strain detecting mechanism provided on one side of the bottom for detecting a strain of the bottom; and, a pressure-introducing joint for introducing the fluid to be measured into the bottomed cylindrical member, the pressure-introducing joint comprising an annular joint surface and an annular step for receiving an inner circumference of the cylindrical member of the pressure detector, the method comprising the steps of: welding by butt-welding an end of the cylindrical portion of the bottomed cylindrical member and an end of the pressure-introducing joint at the joint surface to a depth beyond the annular step; and melting the pressure-introducing joint in parallel to a weld bead formed by the welding and partially overlaid on a periphery of the weld bead, a depth of the melting being shallower than the depth of the welding.