To provide a magnetic field sensor, a recording device and a measurement system whose structure can be simplified and which can deal with a wide range of magnetic field strength.
A magnetic field sensor 6 for detecting magnetic field strength of a transceiver for transmitting/receiving information to/from an electromagnetic induction tag by electromagnetic waves includes: an antenna 61 for generating induction current depending on the magnetic field strength by electromagnetic induction; and an output part 62 for outputting the induction current generated by the antenna 61. Among them, for the antenna 61, a reception frequency identical to that of a transmitting/receiving antenna included in the electromagnetic induction tag is set, and the antenna 61 is provided so as to be replaceable.
NODA RYUZO
IWAKIRI GEN
MATSUO KAZUAKI
CDN CORP