1. An image processing device comprising: circuitry configured to operate as: a predictive motion vector generating unit that sets a co-located block to be not available as a condition that a type of a reference picture of a current block is different from a type of the reference picture of a co-located block included in a co-located picture and generates a predictive motion vector of the current motion vector; and a reconstructing unit that reconstructs the current motion vector by using the predictive motion vector generated by the predictive motion vector generating unit.