An antenna substrate (A) comprising: a cap substrate including a first insulating layer and a plurality of first antenna conductors arranged in vertical and horizontal directions on upper and lower surfaces of the first insulating layer , the plurality of first antenna conductors being positioned opposite to each other with the first insulating layer therebetween; a frame substrate including a second insulating layer and a plurality of openings located in the second insulating layer , each of the plurality of openings having an outer periphery that surrounds an individual or a collective number of outer peripheries of the plurality of first antenna conductors in a top view; a base substrate including a third insulating layer and a plurality of second antenna conductors located on an upper surface of the third insulating layer ; a first adhesive material provided between a lower surface of the first insulating layer and an upper surface of the second insulating layer in a region other than a region where the opening is located, the first adhesive material adhering the first insulating layer and the second insulating layer to each other; and a second adhesive material provided between a lower surface of the second insulating layer and the upper surface of the third insulating layer in a region other than a region where the opening is located, the second adhesive material adhering the second insulating layer and the third insulating layer to each other, characterized in that : each of the first adhesive material and the second adhesive material at least includes a first bonding member and a second bonding member at a different position than the first bonding member , the first bonding member being located outside a region where the first antenna conductor is disposed, the second bonding member being partially in contact with the first bonding member , the second bonding member having an adhesive strength to the second insulating layer greater than that of the first bonding member . a cap substrate including a first insulating layer and a plurality of first antenna conductors arranged in vertical and horizontal directions on upper and lower surfaces of the first insulating layer , the plurality of first antenna conductors being positioned opposite to each other with the first insulating layer therebetween; a frame substrate including a second insulating layer and a plurality of openings located in the second insulating layer , each of the plurality of openings having an outer periphery that surrounds an individual or a collective number of outer peripheries of the plurality of first antenna conductors in a top view; a base substrate including a third insulating layer and a plurality of second antenna conductors located on an upper surface of the third insulating layer ; a first adhesive material provided between a lower surface of the first insulating layer and an upper surface of the second insulating layer in a region other than a region where the opening is located, the first adhesive material adhering the first insulating layer and the second insulating layer to each other; and a second adhesive material provided between a lower surface of the second insulating layer and the upper surface of the third insulating layer in a region other than a region where the opening is located, the second adhesive material adhering the second insulating layer and the third insulating layer to each other, characterized in that : each of the first adhesive material and the second adhesive material at least includes a first bonding member and a second bonding member at a different position than the first bonding member , the first bonding member being located outside a region where the first antenna conductor is disposed, the second bonding member being partially in contact with the first bonding member , the second bonding member having an adhesive strength to the second insulating layer greater than that of the first bonding member . <EOS>