An animal emotion estimation device includes: a sound collector configured by an elastic member having a recess, a sound concentrating microphone provided on the bottom portion of the recess, and an impact absorber covering the entire of the elastic member and the sound concentrating microphone； a harness to mount the sound collector on an animal； a converter that filters and converts the sound collected through the sound collector into a heart rate signal； an estimation portion that estimates the emotion of the animal based on the heart rate signal； and an output unit that supplies information showing the estimation estimated by the estimation portion.
