An Automatic Train Control, ATC, antenna device provided on a body of a lead car to receive signals from outside by electromagnetic coupling, the ATC antenna device comprising: a pair of ATC antenna coils (4a, 4b) disposed symmetrically with respect to a vertical center line of the body as viewed in a traveling direction of the body, the paired ATC antenna coils (4a, 4b) being connected in series and oppositely phased; and an ATC antenna support (2, 30, 50) configured to be attached to the body to support the paired ATC antenna coils (4a, 4b) and configured to be disposed asymmetrically with respect to the vertical center line; the ATC antenna device being characterized in that: the ATC antenna support (2, 30, 50) includes two vertically extending ATC antenna support bars configured to be disposed to the right and to the left of the vertical center line with a prescribed distance therebetween, wherein the top end of the two ATC antenna support bars are configured to be fixed to the bottom portion of an underfloor frame of the body, in that the ATC antenna support (2, 30, 50) includes a horizontally extending ATC antenna support base that is suspended from both bottom ends of the two ATC antenna support bars, and in that the ATC antenna support (2, 30, 50) includes ATC antenna attaching members both of which are disposed on the bottom portion of the ATC antenna support base, and oriented in a same lateral direction, the paired ATC antenna coils (4a, 4b) being fixedly attached to the ATC antenna attaching members, either both the right side or both to the left side of the ATC antenna attaching members. a pair of ATC antenna coils (4a, 4b) disposed symmetrically with respect to a vertical center line of the body as viewed in a traveling direction of the body, the paired ATC antenna coils (4a, 4b) being connected in series and oppositely phased; and an ATC antenna support (2, 30, 50) configured to be attached to the body to support the paired ATC antenna coils (4a, 4b) and configured to be disposed asymmetrically with respect to the vertical center line; the ATC antenna device being characterized in that: the ATC antenna support (2, 30, 50) includes two vertically extending ATC antenna support bars configured to be disposed to the right and to the left of the vertical center line with a prescribed distance therebetween, wherein the top end of the two ATC antenna support bars are configured to be fixed to the bottom portion of an underfloor frame of the body, in that the ATC antenna support (2, 30, 50) includes a horizontally extending ATC antenna support base that is suspended from both bottom ends of the two ATC antenna support bars, and in that the ATC antenna support (2, 30, 50) includes ATC antenna attaching members both of which are disposed on the bottom portion of the ATC antenna support base, and oriented in a same lateral direction, the paired ATC antenna coils (4a, 4b) being fixedly attached to the ATC antenna attaching members, either both the right side or both to the left side of the ATC antenna attaching members. the ATC antenna support (2, 30, 50) includes two vertically extending ATC antenna support bars configured to be disposed to the right and to the left of the vertical center line with a prescribed distance therebetween, wherein the top end of the two ATC antenna support bars are configured to be fixed to the bottom portion of an underfloor frame of the body, in that the ATC antenna support (2, 30, 50) includes a horizontally extending ATC antenna support base that is suspended from both bottom ends of the two ATC antenna support bars, and in that the ATC antenna support (2, 30, 50) includes ATC antenna attaching members both of which are disposed on the bottom portion of the ATC antenna support base, and oriented in a same lateral direction, the paired ATC antenna coils (4a, 4b) being fixedly attached to the ATC antenna attaching members, either both the right side or both to the left side of the ATC antenna attaching members.