The present invention relates to a conductive printed board which can be used as a common part and therefore offers high productivity, and an ultrasonic probe which uses this conductive printed board. In a conductive printed board having terminals which are provided either in a contiguous manner or at a defined array spacing, and are connected to conduction paths, terminals connected to the terminals and spaced with different array spacing from the defined array spacing are provided on the ends. The conductive printed board is a flexible printed board, and a plurality of piezo elements having excitation electrodes on both main faces are lined up at the defined array spacing. If the terminals are widely spaced, the object can connect as-is to the other terminals, and if the terminals are spaced narrowly, then the portion with the other terminals can be removed, allowing the terminals to be connected. Moreover, the present invention relates to a multicore cable for which the weight and diameter of the multicore cable are reduced, thus facilitating multifunctionality, and to an ultrasonic probe with excellent operability and functionality which uses this multicore cable. The multicore cable is constructed by winding a flexible printed board containing signal conductors helically within a flexible outer jacket.