An ultrasonic diagnosis apparatus comprising: an array transducer which is composed of a plurality of transducer elements; a delay processing unit which performs delay processing with respect to a plurality of element reception signals output from the plurality of transducer elements; a summing processing unit which performs summing processing with respect to the plurality of element reception signals having been subjected to the delay processing and outputs a reception signal; a circuit which extracts a sign data array (b 0,..., b N-1) formed of a plurality of N sign data items arranged in an element arranging direction, from the plurality of element reception signals having been subjected to the delay processing but not having been subjected to the summing processing, wherein N is the number of receiving channels; wherein a sign data item indicates whether an instantaneous amplitude value of an element reception signal is positive or negative; an evaluation value computing unit which computes an evaluation value GSCF based on the ratio of the power value of the DC vicinity components of a binary signal to the whole power of the binary signal according to the equation GSCF = ∑ m = 0 M ∑ i = 0 N − 1 b i ⋅ exp − j ⋅ 2 π ⋅ i ⋅ m N 2 N ⋅ ∑ i = 0 N − 1 b i 2 p or an evaluation value GSCF according to the equation GSCF = ∑ m = 0 M ∑ i = 0 N − 1 a i ⋅ b i ⋅ exp − j ⋅ 2 π ⋅ i ⋅ m N 2 N ⋅ ∑ i = 0 N − 1 a i 2 p, with M representing the DC vicinity component with the highest frequency, (a 0,..., a N-1) being an array of weight values and p representing a parameter for adjusting the evaluation value; and a gain adjustment unit which adjusts gain of the reception signal by using the evaluation value. an array transducer which is composed of a plurality of transducer elements; a delay processing unit which performs delay processing with respect to a plurality of element reception signals output from the plurality of transducer elements; a summing processing unit which performs summing processing with respect to the plurality of element reception signals having been subjected to the delay processing and outputs a reception signal; a circuit which extracts a sign data array (b 0,..., b N-1) formed of a plurality of N sign data items arranged in an element arranging direction, from the plurality of element reception signals having been subjected to the delay processing but not having been subjected to the summing processing, wherein N is the number of receiving channels; wherein a sign data item indicates whether an instantaneous amplitude value of an element reception signal is positive or negative; an evaluation value computing unit which computes an evaluation value GSCF based on the ratio of the power value of the DC vicinity components of a binary signal to the whole power of the binary signal according to the equation GSCF = ∑ m = 0 M ∑ i = 0 N − 1 b i ⋅ exp − j ⋅ 2 π ⋅ i ⋅ m N 2 N ⋅ ∑ i = 0 N − 1 b i 2 p or an evaluation value GSCF according to the equation GSCF = ∑ m = 0 M ∑ i = 0 N − 1 a i ⋅ b i ⋅ exp − j ⋅ 2 π ⋅ i ⋅ m N 2 N ⋅ ∑ i = 0 N − 1 a i 2 p, with M representing the DC vicinity component with the highest frequency, (a 0,..., a N-1) being an array of weight values and p representing a parameter for adjusting the evaluation value; and a gain adjustment unit which adjusts gain of the reception signal by using the evaluation value.