A heterogeneous material joint structure (S) comprising: a resin panel that is configured by a fiber reinforced plastic and that is formed with a plurality of first holes in a row along a vehicle front-rear direction at either vehicle width direction side portion of the resin panel ; a metal panel that is configured by a metal and that includes a left and right pair of first reinforcements that extend along the vehicle front-rear direction and are formed with a plurality of second holes at locations facing the first holes, and a second reinforcement that extends along the vehicle width direction between the first reinforcements and has both vehicle width direction end portions joined to the first reinforcements; and rivets that are inserted into the first holes and into the second holes , that join the resin panel and the metal panel together in a state in which a head portion configuring one end portion of each of the rivets is disposed at the resin panel side and a flange portion configuring another end portion of each of the rivets is disposed at the metal panel side, a diameter dimension of the head portion being set larger than a diameter dimension of the flange portion, wherein: recessed portions that project out from a general portion of the resin panel toward the metal panel side and abut the metal panel are formed in the resin panel; the first holes are formed in the respective recessed portions; and the head portion of each of the rivets is closer to the metal panel than a respective surface of the general portion of the resin panel that is further away from the metal panel . a resin panel that is configured by a fiber reinforced plastic and that is formed with a plurality of first holes in a row along a vehicle front-rear direction at either vehicle width direction side portion of the resin panel ; a metal panel that is configured by a metal and that includes a left and right pair of first reinforcements that extend along the vehicle front-rear direction and are formed with a plurality of second holes at locations facing the first holes, and a second reinforcement that extends along the vehicle width direction between the first reinforcements and has both vehicle width direction end portions joined to the first reinforcements; and rivets that are inserted into the first holes and into the second holes , that join the resin panel and the metal panel together in a state in which a head portion configuring one end portion of each of the rivets is disposed at the resin panel side and a flange portion configuring another end portion of each of the rivets is disposed at the metal panel side, a diameter dimension of the head portion being set larger than a diameter dimension of the flange portion, wherein: recessed portions that project out from a general portion of the resin panel toward the metal panel side and abut the metal panel are formed in the resin panel; the first holes are formed in the respective recessed portions; and the head portion of each of the rivets is closer to the metal panel than a respective surface of the general portion of the resin panel that is further away from the metal panel . recessed portions that project out from a general portion of the resin panel toward the metal panel side and abut the metal panel are formed in the resin panel; the first holes are formed in the respective recessed portions; and the head portion of each of the rivets is closer to the metal panel than a respective surface of the general portion of the resin panel that is further away from the metal panel . <EOS>