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We present optical UBVRI photometry and medium resolution spectroscopy of thetype Ib supernova iPTF13bvn, spanning a phase of $\sim$ $-13\,$d to $+71\,$dwith respect to $B$-band maximum. The post maximum decline rates indicate afast decline with $\Delta m_{15}(B) = 1.82$. Correcting for a galacticextinction $E(B-V){\rm_{MW}}=0.045$ and host galaxy extinction of$E(B-V){\rm_{host}}=0.17$, the absolute $V$-band magnitude peaks atM$_V=-17.23\, \pm \,0.20$. The bolometric light curve indicates that $\sim0.09$ M$_{\odot}$ of $^{56}$Ni was synthesized in the explosion. The earliestspectrum ($-13$d) shows the presence of He~{\sc i} 5876 \AA\ feature at avelocity of $\sim$15000 km s$^{-1}$, which falls rapidly by the time the SNapproaches the epoch of B-band maximum. The photospheric velocity near maximumlight, as indicated by the Fe~{\sc ii} 5169~\AA\ feature, is $\sim 9000$ kms$^{-1}$. The estimate for the $^{56}$Ni mass, together with the estimates forthe ejected mass ($M_{\rm{ej}}$) and kinetic energy of the explosion($E_{\rm{k}}$) indicate that iPTF13bvn is a low luminosity type Ib supernova,with a lower than average ejected mass and kinetic energy. Our results suggestthat the progenitor of iPTF13bvn is inconsistent with a single Wolf-Rayet star.

Optical observations of the fast declining type Ib supernova iPTF13bvn