A tire state detecting device arranged in each of a plurality of wheels of a vehicle, the vehicle including a rotation position detecting unit that is configured to detect a rotation position of each of the plurality of wheels, the tire state detecting device comprising: a state detecting unit (32, 33) that is configured to detect a state of a tire; an acceleration sensor that rotates integrally with the wheel and is configured to detect a gravitational acceleration value; an acquiring unit that is configured to acquire the gravitational acceleration value for every angle defined in advance while the wheel makes one rotation; characterized in that said tire state detecting device comprises further a calculating unit that, assuming an angle of the wheel at which the gravitational acceleration value is acquired is an acquiring angle (P1-P8), is configured to calculate an acceleration difference of the gravitational acceleration value acquired at a first acquiring angle and the gravitational acceleration value acquired at a second acquiring angle, the first acquiring angle being an acquiring angle after an acquiring angle at which the gravitational acceleration value is inverted from increase to decrease or from decrease to increase, and the second acquiring angle being an angle before the first acquiring angle; a storage unit that is configured to store a correction formula defined in advance based on an angular difference between the adjacent acquiring angles and an angular difference of the first acquiring angle and the second acquiring angle, and is configured to correct the first acquiring angle to an angle determined in advance from the acceleration difference; a transmission unit that is configured to transmit a transmission signal including information indicating the angle determined in advance in addition to information indicating the state of the tire; and a control unit that is configured to cause the transmission signal to be transmitted to a wheel position specifying device that specifies on which one of the plurality of wheels the tire state detecting device is arranged by acquiring a rotation position of the wheel detected by the rotation position detecting unit with reception of the transmission signal transmitted from the transmission unit as a trigger. a state detecting unit (32, 33) that is configured to detect a state of a tire; an acceleration sensor that rotates integrally with the wheel and is configured to detect a gravitational acceleration value; an acquiring unit that is configured to acquire the gravitational acceleration value for every angle defined in advance while the wheel makes one rotation; characterized in that said tire state detecting device comprises further a calculating unit that, assuming an angle of the wheel at which the gravitational acceleration value is acquired is an acquiring angle (P1-P8), is configured to calculate an acceleration difference of the gravitational acceleration value acquired at a first acquiring angle and the gravitational acceleration value acquired at a second acquiring angle, the first acquiring angle being an acquiring angle after an acquiring angle at which the gravitational acceleration value is inverted from increase to decrease or from decrease to increase, and the second acquiring angle being an angle before the first acquiring angle; a storage unit that is configured to store a correction formula defined in advance based on an angular difference between the adjacent acquiring angles and an angular difference of the first acquiring angle and the second acquiring angle, and is configured to correct the first acquiring angle to an angle determined in advance from the acceleration difference; a transmission unit that is configured to transmit a transmission signal including information indicating the angle determined in advance in addition to information indicating the state of the tire; and a control unit that is configured to cause the transmission signal to be transmitted to a wheel position specifying device that specifies on which one of the plurality of wheels the tire state detecting device is arranged by acquiring a rotation position of the wheel detected by the rotation position detecting unit with reception of the transmission signal transmitted from the transmission unit as a trigger.