Attachment/detachment of tablet cutting blades to/from a tablet cutting blade replacement jig inserted into and withdrawn from a tablet splitting apparatus to receive and deliver the tablet cutting blades is facilitated even in a dispensing site. The cutting edges of the tablet cutting blades are allowed to be exposed without detaching the tablet cutting blades. The tablet cutting blade replacement jig (60) includes: a jig main body (61) that can be inserted into and withdrawn from support members (28) in place of a falling tablet guiding member; blade holders (64) for retaining tablet cutting blades (41) within notches (63) of the jig main body (61); operating members (72) that are manually operated to switch between maintenance and release of retention of the tablet cutting blades; and urging members for maintaining the switched state even though the switched state is on a retention maintained side or is on a retention released side. Two openable-closable plate-shaped bodies (61a and 61b) are disposed in the jig main body (61), and the tablet cutting blades (41) are held with their cutting edges oriented toward inward surfaces of the two plate-shaped bodies (61a and 61b) in a closed state.