An acoustic wave measuring apparatus includes a plate pressed against a subject, a probe that has an acoustic wave conversion unit for receiving an acoustic wave emitted from the subject through the plate to convert into an electric signal, a seal member provided on the probe so as to enclose a periphery of the acoustic wave conversion unit for forming a space to hold lubricant between the plate and the acoustic wave conversion unit, a providing unit that provides the lubricant into the space formed by the seal member and a lubricant monitoring unit that detects whether the space is filled with the lubricant.