A bioinformation acquisition apparatus, comprising: an electromechanical conversion element group including a plurality of arranged electromechanical conversion elements, each receiving an elastic wave emitted by irradiating an electromagnetic wave to a test object in a test body to convert the received elastic wave into an electric signal; and a moving device moving the electromechanical conversion element group into an arrangement direction of the electromechanical conversion elements; the apparatus characterized by further comprising: an adding device adding electric signals transmitted from at least two or more electromechanical conversion elements, and a processing device obtaining image information on the basis of added signals in which the electric signals are added by the adding device, wherein the adding device adds an electric signal transmitted from a first electromechanical conversion element positioned at a position corresponding to a specified position to the test body among electric signals transmitted from the electromechanical conversion element group when the electromechanical conversion element group receives the elastic waves at a first position, and an electric signal transmitted from a second electromechanical conversion element positioned at the position corresponding to the specified position among electric signals transmitted from the electromechanical conversion element group when the electromechanical conversion element group receives the elastic waves at a second position. an electromechanical conversion element group including a plurality of arranged electromechanical conversion elements, each receiving an elastic wave emitted by irradiating an electromagnetic wave to a test object in a test body to convert the received elastic wave into an electric signal; and a moving device moving the electromechanical conversion element group into an arrangement direction of the electromechanical conversion elements; the apparatus characterized by further comprising: an adding device adding electric signals transmitted from at least two or more electromechanical conversion elements, and a processing device obtaining image information on the basis of added signals in which the electric signals are added by the adding device, wherein the adding device adds an electric signal transmitted from a first electromechanical conversion element positioned at a position corresponding to a specified position to the test body among electric signals transmitted from the electromechanical conversion element group when the electromechanical conversion element group receives the elastic waves at a first position, and an electric signal transmitted from a second electromechanical conversion element positioned at the position corresponding to the specified position among electric signals transmitted from the electromechanical conversion element group when the electromechanical conversion element group receives the elastic waves at a second position. an adding device adding electric signals transmitted from at least two or more electromechanical conversion elements, and a processing device obtaining image information on the basis of added signals in which the electric signals are added by the adding device, wherein the adding device adds an electric signal transmitted from a first electromechanical conversion element positioned at a position corresponding to a specified position to the test body among electric signals transmitted from the electromechanical conversion element group when the electromechanical conversion element group receives the elastic waves at a first position, and an electric signal transmitted from a second electromechanical conversion element positioned at the position corresponding to the specified position among electric signals transmitted from the electromechanical conversion element group when the electromechanical conversion element group receives the elastic waves at a second position.