An LED lighting device is provided which is capable of being connected to a network and being controlled by a host computer also connected to the network. At least one face of the two convex lenses in the fourth lens group is formed from an aspheric face. An average SNR and an unbiased variance are then computed for the SNR estimates for the multiple transmission channels. When the base plate portion is curbed in the direction of its thickness, the cuts are deformed and the bent plate portions are bent in the direction of their width, so that the frame members can be deformed easily and positively to a desired curved shape.