A mechanical seal device for sealing an interspace between a housing and a rotary shaft penetrating an aperture formed on said housing to seal fluid inside said housing, having a rotary ring provided on said rotary shaft and having a seal surface at one end portion in the axial direction of said rotary shaft and a stationary ring having a counter surface arranged in a counter manner to said seal surface of said rotary ring, characterized in that said mechanical seal device comprises: a seal cover provided on the housing; a case fitted in an inner circumference surface of said seal cover; a retainer on which said stationary ring is fitted; and bellows for elastically pressing said stationary ring toward said rotary ring via said retainer, an inside end portion of said bellows being connected to said case, an outside end portion of said bellows being connected to said retainer; wherein said stationary ring is provided in said retainer; wherein said stationary ring comprises a first seal surface circularly formed on said counter surface, said first seal surface sealingly contacting to and sliding on said seal surface of said rotary shaft, said first seal surface sealing seal fluid on an inner circumference side, a second seal surface circularly formed on an outer circumference side of said first seal surface of said counter surface in isolation from said first seal surface, said second seal surface sealingly contacting to and sliding on said seal surface of said rotary shaft, said second seal surface sealing a quenching fluid on the inner circumference side against the atmosphere space on the outer circumference side, a sealing groove circularly formed in a part of said isolation between said first seal surface and said second seal surface, and a plurality of fluid passages formed inside of said stationary ring, one aperture of each of said fluid passages communicating to said sealing groove, said mechanical seal device further comprising the quenching fluid supplying passage communicating to the other aperture of each of said fluid passages formed inside of said stationary ring, said quenching fluid supplying passage causing a flow of said quenching fluid into and/or from said sealing groove via said fluid passages, said quenching fluid supplying passage comprising an intermediate chamber formed in an inner circumferential portion of said seal cover, wherein said bellows separates said intermediate chamber and space on the seal fluid side, wherein said intermediate chamber is surrounded by said seal cover, said case, said bellows, said retainer and said stationary ring, said intermediate chamber being sealed from the space on the seal fluid side by the bellows and the O-rings (181, 182), said intermediate chamber (c) being sealed against the atmosphere space by an O-ring provided between an outer circumference surface of said stationary seal ring and an inner circumference surface of said seal cover, wherein said other aperture of each of said fluid passages in said stationary ring communicates to said intermediate chamber, said intermediate chamber and said sealing groove of said stationary ring is communicated by said plurality of fluid passages, and wherein said first seal surface and said second seal surface of said stationary ring are formed as a duplex seal surfaces, one of them acting as a seal for sealing said seal fluid inside said housing from said quenching fluid in said sealing groove, the other acting as a seal for sealing said quenching fluid in said sealing groove against space outside of said housing. a seal cover provided on the housing; a case fitted in an inner circumference surface of said seal cover; a retainer on which said stationary ring is fitted; and bellows for elastically pressing said stationary ring toward said rotary ring via said retainer, an inside end portion of said bellows being connected to said case, an outside end portion of said bellows being connected to said retainer; a first seal surface circularly formed on said counter surface, said first seal surface sealingly contacting to and sliding on said seal surface of said rotary shaft, said first seal surface sealing seal fluid on an inner circumference side, a second seal surface circularly formed on an outer circumference side of said first seal surface of said counter surface in isolation from said first seal surface, said second seal surface sealingly contacting to and sliding on said seal surface of said rotary shaft, said second seal surface sealing a quenching fluid on the inner circumference side against the atmosphere space on the outer circumference side, a sealing groove circularly formed in a part of said isolation between said first seal surface and said second seal surface, and a plurality of fluid passages formed inside of said stationary ring, one aperture of each of said fluid passages communicating to said sealing groove,