The present invention relates to a process for producing a cationic hydroxypropyl cellulose including the step of reacting a low-crystalline powdery cellulose with a cationizing agent represented by the following general formula (1) and/or a cationizing agent represented by the following general formula (2), and propylene oxide in the presence of water in an amount of from 10 to 60% by mass on the basis of the low-crystalline powdery cellulose, and a catalyst: wherein R1 to R3 are each independently a linear or branched hydrocarbon group having 1 to 4 carbon atoms; and X and Z are each a halogen atom and may be the same or different from each other.