To provide a vector quantization device, a voice coding device, a vector quantization method, and a voice coding method, which enable a reduction in the calculation amount of voice codec without deterioration of voice quality.SOLUTION: In the vector quantization device, a first reference vector calculation unit (201) calculates a first reference vector by multiplying a target vector x by an auditory weighting LPC synthesis filter H, and a second reference vector calculation unit (202) calculates a second reference vector by multiplying an element of the first reference vector by a filter having a high-pass characteristic. A polarity preliminary selection unit (205) generates a polar vector by disposing a unit pulse having a positive or negative polarity, which is selected on the basis of the polarity of an element of the second reference vector, in the position of the element.SELECTED DRAWING: Figure 3
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