The big-footed myotis roosts in caves and unused tunnels in Japan. Its back is grayish to blackish brown, with paler fur underneath.
The dorsal fur is grayish or blackish brown, while the underside is paler grayish brown. The ears are long and narrow, with a long pointed tragus.
It mainly catches flies, moths, and spiders, and roosts in natural caves, abandoned mines, unused tunnels, and bomb shelters.
An extinction-risk assessment has not been added yet.