  The DeeMe experiment is planned to search for muon-to-electron conversion at
J-PARC MLF. Our goal is to measure the process with a single event sensitivity
of $1 \times 10^{-13}$ or $2 \times 10^{-14}$ for a graphite or silicon carbide
target. That is one or two orders of magnitude better than the current upper
limits, $7 \times 10^{-13}$ for a gold target by the SINDRUM-II experiment at
PSI and $4.6 \times 10^{-12}$ for a titanium target by the experiment at
TRIUMF. We are in the middle of preparation for the experiment. The
construction of the secondary beamline, H Line, is now in progress. Four
tracking detectors have been manufactured in 2017, and the optimization study
of the filling gas is ongoing to improve the performance. After getting the
better hit efficiency, we measured the momentum spectrum of electrons produced
through muon-decay-in-orbit from a carbon target at J-PARC MLF D2 Area in
March, 2019. In this paper, the preparation status of the DeeMe experiment will
be presented.
