Patent ID: 8333386

Claim:
A seal structure for connection sections comprising: a first part including a connection section formed with a first groove-ridge section; a second part including a connection section formed with a second groove-ridge section; and a seal member placed between the connection sections of the first part and the second part, the seal member comprising a first fitting portion in a first surface engageable with the first groove-ridge section and a second fitting portion in a second surface engageable with the second groove-ridge section, each of the first and second fitting portions being formed with a press-fitting interference in the thickness direction, wherein: the seal member includes an extended section extending outside an annular body section including the first and second fitting portions in a radially outward direction so that the extended section protrudes outward than the connection sections of the first and second parts and a holding portion extending from an end portion of the extended section in a direction orthogonal to the extended section, the first fitting portion is formed with a first annular groove, the press-fitting interference being formed on an inner periphery of the first annular groove, the second fitting portion is formed with a second annular groove, the press-fitting interference being formed on an inner periphery of the second annular groove, and the first and second annular grooves, the press-fitting interferences of the first and second fitting portions, and the holding portion are formed in parallel to each other.