guide slope 82 on the first half 8 and the guide slope 91 on the second half 9 play a guiding role when the field optical fiber 131 enters the optical fiber splice groove 83 enabling the field optical fiber 131 to enter smoothly when the field optical fiber 131 enters the optical fiber splice groove 83 and arrives at the position where it is to be butt jointed with the connecting optical fiber 6 the optical fiber splice member 10 is pressed along the direction as shown by the arrow c in fig1 making the quadrangular prism 71 slide along the transition slope 104 from the lower part 102 of the locking channel to the upper part 101 as shown in fig1 because the upper part 101 is narrower than the lower part 102 the inner wall of the upper part 101 of the locking channel squeezes the rib 81 on the first half 8 of the optical fiber splice member compressing the first half 8 and the second half 9 tightly together and the connecting optical fiber 6 and the field optical fiber 131 are clamped inside the optical fiber splice groove 83 on the first half 8 making the optical fiber splice member in the closed state for facilitating recognization of the press direction the optical fiber splice member clamp 10 is provided with an indicating arrow 103 the process of loosing the optical fiber splice member contrary to the above process is done by simply pressing the optical fiber splice member clamp 10 in the contrary direction which will no longer be described the optical fiber splice sleeve 7 the optical fiber splice member and.