Provided is an operation input device capable of being easily and reliably operated by an operator. Said operation input device is an information terminal (10) comprising: an outer cover section (1) comprising a flexible band (11) extending in a band shape; and a substrate section (23) housed inside the outer cover section (1) and performing input processing on the basis of a detection signal that detects a prescribed operation. The information terminal (10) has a top surface (31) and a bottom surface (32) that are laminated in the thickness direction of the band (11) and comprises a deformation detection unit (3) that outputs to the substrate section (23) detection signals on the basis of deformation of the top surface (31) and the bottom surface (32).
