New Particle Searches with OPAL Detector at LEP

New particle searches using OPAL detector at LEP are reported. Herc the results mainly obtained at centre-of-mass energy of around 183 GeV are summarised for variety of topics other than Higgs searches. We emphasise here the searches for chargino and ncutralino in the Gauge-mediated SUSY breaking scenario in respect of neutralino lifetimes. Also we report on the negative results on the possible anomalous four-jet event production reported by ALEPH collaboration in 1995, with data collected in 1997 at $\sqrt{s}$= 130-136 GeV.