Signal detection device, measurement device, and mass spectrometer

A signal detection device comprising:

• detection equipment including a photoelectric conversion element configured to convert a photon as a detection target into a current signal, and a current-voltage converter configured to convert the current signal into a voltage signal;
• a transmission unit configured to transmit the voltage signal;
• and
• a data collection unit configured to detect and collect the transmitted voltage signal, wherein
• the detection equipment is disposed inside a first shield case connected to a frame ground, and the current-voltage converter includes a differential amplifier having first and second input terminals,
• the first input terminal is connected to a first output terminal of the photoelectric conversion element via a first input resistor,
• the second input terminal is connected to a second output terminal of the photoelectric conversion element and a ground via a second input resistor having a resistance value larger than that of the first input resistor,
• first and second output terminals of the current-voltage converter are connected to the data collection unit by the transmission unit, and
• the transmission unit is connected to the ground together with the current-voltage converter and the data collection unit.