  Mid-infrared (MIR) light from galaxies is sensitive to dust-obscured
star-formation activities because it traces the characteristic emission of dust
heated by young, massive stars. By constructing the MIR luminosity functions
(LFs), we are able to quantify the overall dusty star formation history and the
evolution of galaxies over cosmic time. In this work, we report the first
rest-frame MIR LFs at 7.7, 10, 12.8, 15, 18, and 21 $\mu$m as well as the total
IR LF from the James Webb Space Telescope (JWST) Cosmic Evolution Early Release
Science (CEERS) survey. We identify 506 galaxies at $z=0-5.1$ in the CEERS
survey that also have optical photometry from the Hubble Space Telescope. With
the unprecedented sensitivity of the JWST, we probe the faintest end of the LFs
at $z=0-1$ down to $L^* \sim 10^7 L_\odot$, $\sim 2$ orders of magnitude
fainter than those from the previous generation of IR space telescopes. Our
findings connect well with and continue the faint end of the MIR LFs from the
deepest observations in past works. As a proxy of star formation history, we
present the MIR-based luminosity density up to $z\simeq4.0$, marking the first
probe of the early Universe by JWST MIRI.
