AE signal detection device of grinding wheel

Provided is an AE signal detection device for a grinding wheel, which is capable of detecting an elastic wave from a grinding point of the grinding wheel, does not need to replace an AE sensor, a pre-amplifier, and a communication circuit board when replacing the grinding wheel, suppresses the enlargement of the grinding wheel and the limitation on an applicable grinding device, and can be applied to a grinding wheel having no wheel core. An AE signal detection device (10) for a grinding wheel (14) is provided with: an AE sensor (24) that receives an elastic wave generated by an annular grinding wheel (14) sandwiched between a fixed flange (18) fixed to a rotating shaft (16) and a movable flange (20) provided so as to be able to approach and separate from the fixed flange (18), and outputs an AE signal (SAE); a transmission circuit unit (28) that wirelessly transmits the output AE signal (SAE); and a reception circuit unit that receives the transmitted AE signal (SAE), and the AE sensor (24) is disposed on th