This paper reports on experimental investigations on spanwise variation of vortex shedding behind a pair of circular cylinders placed side-by-side at a small angle between the cylinders. The experiments are conducted in air and in water with Reynolds number 440 based on cylinder diameter. In addition to flow visualization studies, measurements are carried out with the DPIV technique and hot-wire probes. The vortex roll-ups and sheddings are compared with those behind parallel pairs of cylinders. The wake pattern behind the nonparallel pair of cylinders varies in the spanwise direction between the two ends from mostly independent vortex shedding to almost single-body wake structure. At the intermediate spacing, strong wake interactions and biased gap flows are observed. The spatial variation of the timeaveraged vortex shedding frequency is similar to those observed behind a parallel pair of circular cylinders corresponding to the local spacing ratios, except for the modified shedding frequency due to flow three-dimensionality. The variation in vortex shedding, however, occurs discretely in the spanwise direction rather than continuously. The boundary between the biased gap flow and the mostly independent vortex shedding is located in the spanwise region where the spacing is slightly above the cylinder diameter. These regions were separated by intermittent and timedependent vortex bifurcations and locally oblique vortex shedding resulting in spanwise variation of vortex shedding frequency.