A variable-length decoding device includes a data determination unit which determines whether or not each of component values decoded by a variable-length decoding unit is a specific value; a data buffer that holds only a component value which is not the specific value; a last valid data determination unit which determines component values other than the last one of the component values not the specific value in a block; a flag buffer which holds flags each having a corresponding component value among the component values from the component value at the beginning of the block to the last component value and indicating whether or not the corresponding component value is the specific value; a flag buffer control unit which sets the flags; a data buffer control unit which controls writing in the data buffer; and a selecting unit which selects either zero or a coefficient read from the data buffer.