A cooled color CCD camera was successfully applied for simultaneous neutron and gamma ray radiography at the second thermal neutron radiography field (TNRF-2) of the Japan Research Reactor 3 M in Japan Atomic Energy Research Institute. By decreasing the n/γ ratio of the field by inserting an acrylic resin plate optimum beam condition could be achieved. In this condition color image was taken and neutron and gamma ray images could be derived from the red and green components. Position gap could not be observed in those images. This imaging technique would be applied to simultaneous neutron and gamma-ray CT.