An emergency release mechanism for fluid loading equipment, the emergency release mechanism comprising a pair of couplers that are coupled to each other by a clamp such that the couplers are separable from each other, wherein each of the pair of couplers includes: a coupler main part with a vacuum double-pipe structure; a valve seat provided inside a distal end of the coupler main part, the valve seat forming an opening through which a cargo fluid flows; a valve body disposed in the coupler main part such that the valve body is movable in an axial direction of the coupler main part; and a spring that urges the valve body toward the valve seat, the valve body is configured such that, at a time of separating the couplers from each other, in each coupler, the valve body is brought into contact with the valve seat by urging force of the spring so as to close the opening, and at a time of coupling the couplers to each other, the valve body of each coupler is pressed by the valve body of the other coupler so as to move away from the valve seat and open the opening, and the valve body includes: a holding member that holds a sealing material that seals between the valve body and the valve seat when the valve body is in contact with the valve seat; a block made of a resin, the block covering a distal end surface of the holding member; and an operating member made of a metal, the operating member accommodating the block and protruding from the holding member in a manner to pass through the opening. each of the pair of couplers includes: a coupler main part with a vacuum double-pipe structure; a valve seat provided inside a distal end of the coupler main part, the valve seat forming an opening through which a cargo fluid flows; a valve body disposed in the coupler main part such that the valve body is movable in an axial direction of the coupler main part; and a spring that urges the valve body toward the valve seat, a coupler main part with a vacuum double-pipe structure; a valve seat provided inside a distal end of the coupler main part, the valve seat forming an opening through which a cargo fluid flows; a valve body disposed in the coupler main part such that the valve body is movable in an axial direction of the coupler main part; and a spring that urges the valve body toward the valve seat, the valve body is configured such that, at a time of separating the couplers from each other, in each coupler, the valve body is brought into contact with the valve seat by urging force of the spring so as to close the opening, and at a time of coupling the couplers to each other, the valve body of each coupler is pressed by the valve body of the other coupler so as to move away from the valve seat and open the opening, and at a time of separating the couplers from each other, in each coupler, the valve body is brought into contact with the valve seat by urging force of the spring so as to close the opening, and at a time of coupling the couplers to each other, the valve body of each coupler is pressed by the valve body of the other coupler so as to move away from the valve seat and open the opening, and the valve body includes: a holding member that holds a sealing material that seals between the valve body and the valve seat when the valve body is in contact with the valve seat; a block made of a resin, the block covering a distal end surface of the holding member; and an operating member made of a metal, the operating member accommodating the block and protruding from the holding member in a manner to pass through the opening. a holding member that holds a sealing material that seals between the valve body and the valve seat when the valve body is in contact with the valve seat; a block made of a resin, the block covering a distal end surface of the holding member; and an operating member made of a metal, the operating member accommodating the block and protruding from the holding member in a manner to pass through the opening.