An antenna sheet (100; 200; 300; 400) in which a transmission/reception antenna pattern is formed, comprising: a non-antenna pattern area in which the antenna pattern is not formed; a mounting section including the non-antenna pattern area on which an integrated circuit chip electrically connected with the antenna pattern is mounted; a first loop forming section, including a first folding area and a second folding area, that extends from both ends of the mounting section that holds the IC chip therebetween toward both ends of the antenna sheet (100; 200; 300; 400) and that forms a first loop (10; 30; 50) by folding the first folding area and the second folding area to the back side of the mounting section on which the IC chip is mounted, characterized by: an intersection portion (150; 250; 350) arranged such that upon formation of the first loop (10; 30; 50), at least parts of both forefronts of the first loop forming section to intersect with each other; and a second loop forming section (160; 260; 360), including a third folding area (161; 261; 361) and a fourth folding area (162; 262; 362), that extends from the forefronts of the first loop forming section that intersect in the intersection portion (150; 250; 350) toward both ends of the antenna sheet (100; 200; 300; 400) and forms a second loop (20; 40; 60) outside the first loop (10; 30; 50) by folding the third folding area and the fourth folding area in the direction of the first loop, wherein the intersection portion includes a first slit section (151, 152) formed by forming a slit in both forefronts of the first loop forming section in a direction vertical to an extension direction of the first loop forming section, and an intersection is made by fitting one forefront of the first loop forming section into the first slit section (151, 152) of the other forefront. a non-antenna pattern area in which the antenna pattern is not formed; a mounting section including the non-antenna pattern area on which an integrated circuit chip electrically connected with the antenna pattern is mounted; a first loop forming section, including a first folding area and a second folding area, that extends from both ends of the mounting section that holds the IC chip therebetween toward both ends of the antenna sheet (100; 200; 300; 400) and that forms a first loop (10; 30; 50) by folding the first folding area and the second folding area to the back side of the mounting section on which the IC chip is mounted, characterized by: an intersection portion (150; 250; 350) arranged such that upon formation of the first loop (10; 30; 50), at least parts of both forefronts of the first loop forming section to intersect with each other; and a second loop forming section (160; 260; 360), including a third folding area (161; 261; 361) and a fourth folding area (162; 262; 362), that extends from the forefronts of the first loop forming section that intersect in the intersection portion (150; 250; 350) toward both ends of the antenna sheet (100; 200; 300; 400) and forms a second loop (20; 40; 60) outside the first loop (10; 30; 50) by folding the third folding area and the fourth folding area in the direction of the first loop, wherein the intersection portion includes a first slit section (151, 152) formed by forming a slit in both forefronts of the first loop forming section in a direction vertical to an extension direction of the first loop forming section, and an intersection is made by fitting one forefront of the first loop forming section into the first slit section (151, 152) of the other forefront. an intersection portion (150; 250; 350) arranged such that upon formation of the first loop (10; 30; 50), at least parts of both forefronts of the first loop forming section to intersect with each other; and a second loop forming section (160; 260; 360), including a third folding area (161; 261; 361) and a fourth folding area (162; 262; 362), that extends from the forefronts of the first loop forming section that intersect in the intersection portion (150; 250; 350) toward both ends of the antenna sheet (100; 200; 300; 400) and forms a second loop (20; 40; 60) outside the first loop (10; 30; 50) by folding the third folding area and the fourth folding area in the direction of the first loop,