An activity state analyzer 10 configured to analyze an activity state of a cyclist during cycling includes: a sensor unit (21 to 26, 18) configured to acquire sensor data from a plurality of types of sensors including an acceleration sensor 21 and a gyroscope sensor 22 that are attached to a lower back of the cyclist, and a CPU 11 configured to analyze an activity state of the cyclist during cycling based on a detection output from the plurality of types of sensors of the sensor unit (21 to 26, 18) .
