To provide a multiplolar aray device capable of laying planar luminous or light receiving array elements, and attached circuit elements at high density, and easikly forming wiring across the array elements and the circuit elements.

This multipolar device has a fixing seay 2 formed to have array elements 1 with electrides 1ep and circuit elements 3 placed thereon, and made of a multilayer substrate. In addition, the multilayer substrate is formed to have pattern layers 2b, 2d with electrode pads 2pd on the sides and an intermediate layer 2c with the array elements 1 fixed to the side. The layers 2b-2d have wiring pattedns 2pt on both upper and lower sides, and through-hole conductirs are 1ed through, thereby contributing to horizontal and vertical wiring. In this case, the electrodes 1ep and the electrode pads 2ps are connected to one another with wires 4.