The cortex outputs the information to several brain areas through different sets of pyramidal cells. It has been shown that cortical pyramidal cells form intra- and inter-laminar subnetworks, depending on pyramidal projection subtypes. To understand cortical information processing related to the high order brain functions, it is important to know how activities of individual pyramidal cell subnetworks are regulated. In the present study, we investigated optogenetically induced network activities in the rat frontal cortical slices. Channel rhodopsin was selectively expressed in L2/3 pyramidal cells by in utero electroporation. Whole-cell recordings were obtained from L5 pyramidal cells and Fast-Spiking (FS) interneurons, while light stimulation was applied to layer 2/3 to induce network activities. Membrane oscillatory activities at the frequency around 30Hz were observed in both pyramidal and FS cells during light stimulations. Moreover, oscillatory activities were frequently found in pyramidal cells projecting to the ipsilateral pontine nuclei. Cross-correlation analysis suggests that pyramidal and FS cells highly interact with each other during oscillations. Our results suggest that oscillatory activities, induced by L2/3 pyramidal cell stimulation, in the cortical circuits depend on the interaction between specific pyramidal cell subtypes and FS interneurons.