The magnetic field offers the significant advantage of enabling non-contact, non-destructive detection of signals within a sample. By utilizing this advantage, we can develop cutting-edge magnetic sensing devices with unprecedented performance and new functionalities, which are applied across a wide range of fields, including medical and bioengineering, analysis and evaluation, and environmental measurement. In our laboratory, we are developing a world-class high-sensitivity magnetic sensor capable of detecting extremely weak magnetic fields, with the goal of applying this sensor to medical and bioengineering as well as non-destructive testing. Specifically, we are developing a magnetic imaging method for cancer using magnetic nanoparticles. In the field of non-destructive testing, we are developing a system for inspecting defects in steel materials used in social infrastructure.