A drilling machine comprising: a first drilling structure that drills a hole, having a first diameter, in an object to be drilled; a second drilling structure that drills a hole, having a second diameter different from the first diameter, in the object to be drilled; a travelling machine that positions the first drilling structure and the second drilling structure in a travelling direction of the travelling machine by travelling in a direction different from a drilling direction; a reader that reads first information recorded a first integrated circuit tag attached on an end portion of each of drilling plates on the side where the travelling machine starts outward travelling, and second information recorded on a second integrated circuit tag attached on an end portion of each of the drilling plates on the side where the travelling machine starts return travelling, the first information being for specifying a first drilling position of the hole having the first diameter, the second information being for specifying a second drilling position of the hole having the second diameter, the drilling plates being attached to the object to be drilled in the travelling direction of the travelling machine; and a controlling device that controls the travelling machine, based on the first information and the second information read by the reader, to control the travelling machine to position the first drilling structure at the first drilling position of the hole having the first diameter and to control the travelling machine to position the second drilling structure at the second drilling position of the hole having the second diameter, wherein the first drilling structure is configured to drill the hole, having the first diameter, in the outward path of the reciprocating travelling machine while the second drilling structure is configured to drill the hole, having the second diameter, in the return path of the travelling machine, characterized in that the controlling device is configured to reset a reference position for every drilling plate in order to control the travelling machine. a first drilling structure that drills a hole, having a first diameter, in an object to be drilled; a second drilling structure that drills a hole, having a second diameter different from the first diameter, in the object to be drilled; a travelling machine that positions the first drilling structure and the second drilling structure in a travelling direction of the travelling machine by travelling in a direction different from a drilling direction; a reader that reads first information recorded a first integrated circuit tag attached on an end portion of each of drilling plates on the side where the travelling machine starts outward travelling, and second information recorded on a second integrated circuit tag attached on an end portion of each of the drilling plates on the side where the travelling machine starts return travelling, the first information being for specifying a first drilling position of the hole having the first diameter, the second information being for specifying a second drilling position of the hole having the second diameter, the drilling plates being attached to the object to be drilled in the travelling direction of the travelling machine; and a controlling device that controls the travelling machine, based on the first information and the second information read by the reader, to control the travelling machine to position the first drilling structure at the first drilling position of the hole having the first diameter and to control the travelling machine to position the second drilling structure at the second drilling position of the hole having the second diameter, wherein the first drilling structure is configured to drill the hole, having the first diameter, in the outward path of the reciprocating travelling machine while the second drilling structure is configured to drill the hole, having the second diameter, in the return path of the travelling machine, characterized in that the controlling device is configured to reset a reference position for every drilling plate in order to control the travelling machine.