A board processing apparatus comprising: a head unit for performing a predetermined operation for a board; and a moving device for moving the head unit in a uniaxial direction (X-direction), the moving device including a guide rail and a sliding member that is moved along the guide rail, wherein the head unit is fixed to the sliding member in such a manner that at least a portion of the head unit protrudes outwardly from an edge face of the sliding member oriented in a moving direction along with the guide rail, characterized in that: the moving device includes a first moving device which includes a first guide rail having a first edge face being a free end, and a first sliding member, and a second moving device which includes a second guide rail having a second edge face being a free end, and a second sliding member, wherein the first and second moving devices are arranged in the uniaxial direction (X-direction) such that the first edge face and the second edge face are in opposed relation to each other; a head unit to be moved by the first moving device is fixed to the first sliding member in such a manner that at least a portion of the head unit protrudes from an edge face of the first sliding member toward the second edge face; and a head unit to be moved by the second moving device is fixed to the second sliding member in such a manner that at least a portion of the head unit protrudes from an edge face of the second sliding member toward the first edge face. a head unit for performing a predetermined operation for a board; and a moving device for moving the head unit in a uniaxial direction (X-direction), the moving device including a guide rail and a sliding member that is moved along the guide rail, wherein the head unit is fixed to the sliding member in such a manner that at least a portion of the head unit protrudes outwardly from an edge face of the sliding member oriented in a moving direction along with the guide rail, characterized in that: the moving device includes a first moving device which includes a first guide rail having a first edge face being a free end, and a first sliding member, and a second moving device which includes a second guide rail having a second edge face being a free end, and a second sliding member, wherein the first and second moving devices are arranged in the uniaxial direction (X-direction) such that the first edge face and the second edge face are in opposed relation to each other; a head unit to be moved by the first moving device is fixed to the first sliding member in such a manner that at least a portion of the head unit protrudes from an edge face of the first sliding member toward the second edge face; and a head unit to be moved by the second moving device is fixed to the second sliding member in such a manner that at least a portion of the head unit protrudes from an edge face of the second sliding member toward the first edge face. the moving device includes a first moving device which includes a first guide rail having a first edge face being a free end, and a first sliding member, and a second moving device which includes a second guide rail having a second edge face being a free end, and a second sliding member, wherein the first and second moving devices are arranged in the uniaxial direction (X-direction) such that the first edge face and the second edge face are in opposed relation to each other; a head unit to be moved by the first moving device is fixed to the first sliding member in such a manner that at least a portion of the head unit protrudes from an edge face of the first sliding member toward the second edge face; and a head unit to be moved by the second moving device is fixed to the second sliding member in such a manner that at least a portion of the head unit protrudes from an edge face of the second sliding member toward the first edge face.