Provided is a board processing apparatus which includes a head unit for performing a predetermined operation for a board, and a moving device for moving the head unit in a uniaxial direction, wherein the moving device includes a guide rail and a sliding member that is moved along the guide rail. 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 thereof.