Patent ID: 7338584

Claim:
An electrophoresis apparatus comprising: a body member; an introducing passage, formed in said body member, for allowing a sample to move from one end of the introducing passage toward the other end thereof; and an analyzing passage, formed in said body member so as to cross said introducing passage in a cross-portion in which the analyzing passage crosses said introducing passage to be communicated therewith, for allowing a part of said sample in said cross-portion to be separated from the other part of said sample in said introducing passage to move by electrophoresis, wherein each of said introducing passage and said analyzing passage is a linear passage, and said analyzing passage is substantially perpendicular to said introducing passage, and wherein corner portions of said cross-portion on the side of an upstream portion of said analyzing passage from said cross-portion in an electrophoresis direction, in which said part of said sample moves by electrophoresis, are chamfered so as to have curved surfaces.