A connector assembly comprising: a first connector including a plurality of first plug contacts and a plurality of first receptacle contacts each having a first elastic piece (24, 25), the plurality of first plug contacts and the plurality of first receptacle contacts being alternately arranged in a grid array and being formed into a flat plate shape, a thickness direction of the first plug contacts being the same as a thickness direction of the first receptacle contacts adjacent to the first plug contacts in a direction perpendicular to the thickness direction of the first plug contacts; and a second connector including a plurality of second plug contacts and a plurality of second receptacle contacts each having a second elastic piece (24, 25), the plurality of second plug contacts and the plurality of second receptacle contacts being alternately arranged in a grid array and being formed into a flat plate shape, a thickness direction of the second plug contact being the same as a thickness direction of the second receptacle contact adjacent to the second plug contact in a direction perpendicular to the thickness direction of the second plug contact, wherein the plurality of first plug contacts are each brought into contact with the second elastic piece of the corresponding second receptacle contact in accordance with elastic deformation of the second elastic piece (24, 25), the plurality of second plug contacts are each brought into contact with the first elastic piece of the corresponding first receptacle contact in accordance with elastic deformation of the first elastic piece (24, 25), and a direction of the elastic deformation of the first elastic piece (24, 25) is different from a direction of the elastic deformation of the second elastic piece (24, 25) in a state in which the first connector and the second connector are mated. a first connector including a plurality of first plug contacts and a plurality of first receptacle contacts each having a first elastic piece (24, 25), the plurality of first plug contacts and the plurality of first receptacle contacts being alternately arranged in a grid array and being formed into a flat plate shape, a thickness direction of the first plug contacts being the same as a thickness direction of the first receptacle contacts adjacent to the first plug contacts in a direction perpendicular to the thickness direction of the first plug contacts; and a second connector including a plurality of second plug contacts and a plurality of second receptacle contacts each having a second elastic piece (24, 25), the plurality of second plug contacts and the plurality of second receptacle contacts being alternately arranged in a grid array and being formed into a flat plate shape, a thickness direction of the second plug contact being the same as a thickness direction of the second receptacle contact adjacent to the second plug contact in a direction perpendicular to the thickness direction of the second plug contact, wherein the plurality of first plug contacts are each brought into contact with the second elastic piece of the corresponding second receptacle contact in accordance with elastic deformation of the second elastic piece (24, 25), the plurality of second plug contacts are each brought into contact with the first elastic piece of the corresponding first receptacle contact in accordance with elastic deformation of the first elastic piece (24, 25), and a direction of the elastic deformation of the first elastic piece (24, 25) is different from a direction of the elastic deformation of the second elastic piece (24, 25) in a state in which the first connector and the second connector are mated.