  We present the 2.12~$\mu$m narrow-band image of the Hubble Deep Field North
taken with the near-infrared camera (CISCO) on the Subaru telescope. Among five
targets whose H$\alpha$ or [O~{\sc iii}] emission lines are redshifted into our
narrow-band range expected from their spectroscopic redshift, four of them have
strong emission lines, especially for the two [O~{\sc iii}] emission-line
objects. The remaining one target shows no H$\alpha$ emission in spite of its
bright rest-UV luminosity, indicating that this object is already under the
post-starburst phase. The volume-averaged $SFR$ derived from the detected two
H$\alpha$ emission is roughly consistent with that evaluated from the rest-UV
continuum.
