This technology relates to a signal processing device, a signal processing method, a recording medium, and a program capable of enabling appropriate beam forming with a simple configuration even when a positional relationship between a plurality of transducers included in a probe of an ultrasonic diagnostic device is not fixed.A reception BF unit calculates a phase difference indicating a relative positional shift between a plurality of transducers based on a difference between each phase difference of a signal of a reflective wave in each of a plurality of transducers of an ultrasonic wave transmitted from a transducer being a transmission target out of a plurality of transducers, relative positions of which are not fixed, and each known phase difference of the signal of the reflective wave in a plurality of transducers in a case in which an arrangement of a plurality of transducers is a reference arrangement. A delay calculating unit calculates a delay amount of each of a plurality of transducers used in the beam forming based on the phase difference calculated by a phase difference calculating unit. This technology may be applied to an ultrasonic diagnostic device.