Disclosed is an object information acquiring apparatus for acquiring object information, including: a probe including a plurality of elements arranged along at least a first direction and configured to sequentially perform transmitting of acoustic wave beams and receiving of reflected waves along the first direction by the plurality of elements a scanning unit configured to set a second direction intersecting the first direction as a main scanning direction and move the probe at a predetermined speed and a adjusting unit configured to acquire information on a measurement depth for acquiring object information in a transmitting direction of the acoustic wave beams and determine the number of times of transmitting of acoustic wave beams and receiving of reflected waves along the first direction based on the depth, resolution of the object information in the main scanning direction, and a moving speed of the probe.
