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We present 5 new transit light curves of GJ 1214b taken in BJHKs-bands. Twotransits were observed in B-band using the Suprime-Cam and the FOCASinstruments onboard the Subaru 8.2m telescope, and one transit was done inJHKs-bands simultaneously with the SIRIUS camera on the IRSF 1.4m telescope.MCMC analyses show that the planet-to-star radius ratios are, Rp/Rs = 0.11651\pm 0.00065 (B-band, Subaru/Suprime-Cam), Rp/Rs = 0.11601 \pm 0.00117 (B-band,Subaru/FOCAS), Rp/Rs = 0.11654 \pm 0.00080 (J-band, IRSF/SIRIUS), Rp/Rs =0.11550 ^{+0.00142}_{-0.00153} (H-band, IRSF/SIRIUS), and Rp/Rs = 0.11547 \pm0.00127 (Ks-band, IRSF/SIRIUS). The Subaru Suprime-Cam transit photometry showsa possible spot-crossing feature. Comparisons of the new transit depths andthose from previous studies with the theoretical models by Howe & Burrows(2012) suggest that the high molecular weight atmosphere (e.g., 1% H$_2$O + 99%N$_2$) models are most likely, however, the low molecular weight (hydrogendominated) atmospheres with extensive clouds are still not excluded. We alsoreport a long-term monitoring of the stellar brightness variability of GJ 1214observed with the MITSuME 50cm telescope in g'-, Rc-, and Ic-bandssimultaneously. The monitoring was conducted for 32 nights spanning 78 nightsin 2012, and we find a periodic brightness variation with a period of Ps = 44.3\pm 1.2 days and semi-amplitudes of 2.1% \pm 0.4% in g'-band, 0.56% \pm 0.08%in Rc-band, and 0.32% \pm 0.04% in Ic-band.

Multi-Color Transit Photometry of GJ 1214b through BJHKs-Bands and a Long-Term Monitoring of the Stellar Variability of GJ 1214