  A new active target named MAIKo (Mu-PIC based Active target for Inverse
Kinematics$_{\circ}$) has been developed at Kyoto University and Research
Center for Nuclear Physics (RCNP), Osaka University. MAIKo is suited for
missing-mass spectroscopy of unstable nuclei at forward scattering angles in
inverse kinematics. MAIKo consists of a time projection chamber (TPC), which
incorporates a micro-pixel chamber ($\mu$-PIC) as the electron multiplication
and collection system. In MAIKo, the medium gas also plays the role of a
reaction target, thus allowing detection of low-energy recoil particles with
high position resolution. The MAIKo TPC was commissioned with
He(93%)+iso-C$_{4}$H$_{10}$(7%) and He(93%)+CO$_{2}$(7%) mixture gasses at 430
hPa. The gas gain and the angular resolution of MAIKo were evaluated with an
alpha source and a $^{4}$He beam at 56 MeV. The TPC was stably operated up to
1000-kcps beam intensity. A tracking algorithm using the Hough transform method
has been developed to analyze scattering events. An angular resolution of
1.3$^{\circ}$ was achieved for scattered $^{4}$He particles.
