A clock dividing device includes an accumulator that accumulates a first accumulated value and a denominator value and stores a second accumulated value, a register that stores a delayed accumulated value obtained by delaying the second accumulated value, a first comparison operation unit that performs a comparative operation on the second accumulated value and a numerator value and stores the second accumulated value as a greater value if the second accumulated value is greater than or equal to the numerator value, a second comparison operation unit that performs a comparative operation on the delayed accumulated value and the numerator value and stores the delayed accumulated value as a delay greater value if the delayed accumulated value is greater than or equal to the numerator value, and a third comparison operation unit that performs a comparative operation on the greater value and the delay greater value and determines the shape of a clock, wherein the shape of the clock is one of a bypass, a rising edge, and a falling edge.