An ultrasonic measuring device, comprising: a first transducer configured to send a first ultrasonic signal to a fluid and to receive a first reflection signal that is the first ultrasonic signal reflected by air-bubbles contained in the fluid, the first transducer receiving a second transmission signal that is a second ultrasonic signal transmitted through the fluid; a second transducer configured to send the second ultrasonic signal to the fluid and to receive a second reflection signal that is the second ultrasonic signal reflected by air-bubbles contained in the fluid, the second transducer receiving a first transmission signal that is the first ultrasonic signal transmitted through the fluid, the second transducer being attached downstream in a direction the fluid is flowing in from the first transducer; a first computing unit configured to perform a correlation calculation of a receive signal obtained when an ultrasonic signal was sent and received in a direction of a flow of the fluid, and a receive signal obtained when the ultrasonic signal was sent and received in an opposite direction to the flow of the fluid, and to acquire a first correlation value to determine a first flow volume indicating the flow volume of the fluid; a second computing unit configured to perform a correlation calculation of a plurality of receive signals obtained by receiving a plurality of reflection signals obtained when the ultrasonic signal was sent through the fluid at predetermined intervals of time, and to acquire a second correlation value to determine a second flow volume indicating the flow volume of the fluid; a first determining unit configured to determine whether or not the first correlation value exceeds a first threshold that is set with consideration for the volume of air-bubbles contained in the fluid; a second determining unit configured to determine whether or not the second correlation value exceeds a second threshold that is set with consideration for the volume of air-bubbles contained in the fluid; a storage unit configured to store a first correction coefficient, which is used in correcting the first flow volume, and a second correction coefficient, which is used in correcting the second flow volume; and a correcting unit configured to output the first flow volume that has been corrected by using the first correction coefficient if the first determining unit determines that the first correlation value exceeds the first threshold, and to output the second flow volume that has been corrected by using the second correction coefficient if the first determining unit determines that the first correlation value does not exceed the first threshold and the second determining unit determines that the second correlation value exceeds the second threshold. a first transducer configured to send a first ultrasonic signal to a fluid and to receive a first reflection signal that is the first ultrasonic signal reflected by air-bubbles contained in the fluid, the first transducer receiving a second transmission signal that is a second ultrasonic signal transmitted through the fluid; a second transducer configured to send the second ultrasonic signal to the fluid and to receive a second reflection signal that is the second ultrasonic signal reflected by air-bubbles contained in the fluid, the second transducer receiving a first transmission signal that is the first ultrasonic signal transmitted through the fluid, the second transducer being attached downstream in a direction the fluid is flowing in from the first transducer; a first computing unit configured to perform a correlation calculation of a receive signal obtained when an ultrasonic signal was sent and received in a direction of a flow of the fluid, and a receive signal obtained when the ultrasonic signal was sent and received in an opposite direction to the flow of the fluid, and to acquire a first correlation value to determine a first flow volume indicating the flow volume of the fluid; a second computing unit configured to perform a correlation calculation of a plurality of receive signals obtained by receiving a plurality of reflection signals obtained when the ultrasonic signal was sent through the fluid at predetermined intervals of time, and to acquire a second correlation value to determine a second flow volume indicating the flow volume of the fluid; a first determining unit configured to determine whether or not the first correlation value exceeds a first threshold that is set with consideration for the volume of air-bubbles contained in the fluid; a second determining unit configured to determine whether or not the second correlation value exceeds a second threshold that is set with consideration for the volume of air-bubbles contained in the fluid; a storage unit configured to store a first correction coefficient, which is used in correcting the first flow volume, and a second correction coefficient, which is used in correcting the second flow volume; and a correcting unit configured to output the first flow volume that has been corrected by using the first correction coefficient if the first determining unit determines that the first correlation value exceeds the first threshold, and to output the second flow volume that has been corrected by using the second correction coefficient if the first determining unit determines that the first correlation value does not exceed the first threshold and the second determining unit determines that the second correlation value exceeds the second threshold.