A seal structure includes a first member including a first joint surface
and a flat third joint surface; a second member including a second joint
surface joined with the first joint surface, a flat fourth joint surface;
and a third member including a fifth joint surface joined, through a
liquid seal, with the flat third and fourth joint surfaces. At least the
second member includes a recessed portion. The fifth joint surface
includes a flat region and a chamfered region which is recessed from the
flat region and which confronts the recessed portion.