A peening apparatus (10, 100), comprising: a processing tank having an opening upward and configured to store abrasive particles and processing liquid, the processing tank configured to fluidize the abrasive particles by the processing liquid; a table (21, 121) disposed inside the processing tank, a workpiece being configured to be placed on the table (21, 121); and a moving unit including a nozzle moving device; characterised in that the moving unit further includes: a quill disposed on the nozzle moving device, a first head having a mounting hole, the first head being disposed at a distal end of the quill, a motor disposed at a basal end of the quill, and a first spindle connected to the motor, the first spindle being exposed from the mounting hole to be disposed inside the first head in a rotatable manner about a vertical axis, and the peening apparatus further comprises: a nozzle head portion separable from the moving unit, the nozzle head portion including a second head having a connection port connected to the mounting hole, the second head being disposed on the first head, a connecting shaft disposed inside the second head, the connecting shaft being connected to the first spindle via the connection port, a second spindle connected to the connecting shaft, the second spindle being disposed in a rotatable manner about a vertical axis in the second head, a nozzle disposed below the second spindle, a nozzle flow path passing inside the second spindle to be connected to the nozzle, the nozzle flow path having an opening at an upper end portion of the second spindle, and a swivel joint disposed at an upper end portion of the second spindle to be connected to the nozzle flow path. a processing tank having an opening upward and configured to store abrasive particles and processing liquid, the processing tank configured to fluidize the abrasive particles by the processing liquid; a table (21, 121) disposed inside the processing tank, a workpiece being configured to be placed on the table (21, 121); and a moving unit including a nozzle moving device; characterised in that the moving unit further includes: a quill disposed on the nozzle moving device, a first head having a mounting hole, the first head being disposed at a distal end of the quill, a motor disposed at a basal end of the quill, and a first spindle connected to the motor, the first spindle being exposed from the mounting hole to be disposed inside the first head in a rotatable manner about a vertical axis, and the peening apparatus further comprises: a nozzle head portion separable from the moving unit, the nozzle head portion including a second head having a connection port connected to the mounting hole, the second head being disposed on the first head, a connecting shaft disposed inside the second head, the connecting shaft being connected to the first spindle via the connection port, a second spindle connected to the connecting shaft, the second spindle being disposed in a rotatable manner about a vertical axis in the second head, a nozzle disposed below the second spindle, a nozzle flow path passing inside the second spindle to be connected to the nozzle, the nozzle flow path having an opening at an upper end portion of the second spindle, and a swivel joint disposed at an upper end portion of the second spindle to be connected to the nozzle flow path. a nozzle moving device; characterised in that the moving unit further includes: a quill disposed on the nozzle moving device, a first head having a mounting hole, the first head being disposed at a distal end of the quill, a motor disposed at a basal end of the quill, and a first spindle connected to the motor, the first spindle being exposed from the mounting hole to be disposed inside the first head in a rotatable manner about a vertical axis, and the peening apparatus further comprises: a nozzle head portion separable from the moving unit, the nozzle head portion including a second head having a connection port connected to the mounting hole, the second head being disposed on the first head, a connecting shaft disposed inside the second head, the connecting shaft being connected to the first spindle via the connection port, a second spindle connected to the connecting shaft, the second spindle being disposed in a rotatable manner about a vertical axis in the second head, a nozzle disposed below the second spindle, a nozzle flow path passing inside the second spindle to be connected to the nozzle, the nozzle flow path having an opening at an upper end portion of the second spindle, and a swivel joint disposed at an upper end portion of the second spindle to be connected to the nozzle flow path. a nozzle head portion separable from the moving unit, the nozzle head portion including a second head having a connection port connected to the mounting hole, the second head being disposed on the first head, a connecting shaft disposed inside the second head, the connecting shaft being connected to the first spindle via the connection port, a second spindle connected to the connecting shaft, the second spindle being disposed in a rotatable manner about a vertical axis in the second head, a nozzle disposed below the second spindle, a nozzle flow path passing inside the second spindle to be connected to the nozzle, the nozzle flow path having an opening at an upper end portion of the second spindle, and a swivel joint disposed at an upper end portion of the second spindle to be connected to the nozzle flow path.