A pet grooming tool comprising: a tool body having a handle portion and an insert slot which are disposed opposite to each other in a longitudinal direction, said insert slot being defined by front and rear wall surfaces (127, 117) which are disposed opposite to each other in the longitudinal direction and each of which extends in a first transverse direction that is transverse to the longitudinal direction, wherein: said tool body further has a latch displacing space which extends therein from said insert slot and which defines a latch displacing path; said pet grooming tool further comprising a latch unit including a latch member having a latch portion which is disposed to be displaceable along the latch displacing path between an unlatch position, where said latch portion is disposed in said latch displacing space, and a latch position, where said latch portion is disposed in said insert slot, and a biasing member disposed in said latch displacing space to bias said latch portion to the latch position; and a plurality of comb plates, each having an insert plate portion which is configured to be inserted into said insert slot in the first transverse direction, and which has two plate major surfaces (312, 313) that are configured to be attached to said front and rear wall surfaces (127, 117), respectively, a latch hole that extends from one of said plate major surfaces (312, 313) toward the other one of said plate major surfaces (312, 313) and that is registered with said latch displacing path when said insert plate portion is inserted into said insert slot so as to permit retaining of said latch portion in said latch hole when said latch portion is in the latch position, and a plate minor surface that interconnects said plate major surfaces (312, 313), and a comb portion which extends from said plate minor surface in the first transverse direction to project outwardly of said tool body. a tool body having a handle portion and an insert slot which are disposed opposite to each other in a longitudinal direction, said insert slot being defined by front and rear wall surfaces (127, 117) which are disposed opposite to each other in the longitudinal direction and each of which extends in a first transverse direction that is transverse to the longitudinal direction, wherein: said tool body further has a latch displacing space which extends therein from said insert slot and which defines a latch displacing path; said pet grooming tool further comprising a latch unit including a latch member having a latch portion which is disposed to be displaceable along the latch displacing path between an unlatch position, where said latch portion is disposed in said latch displacing space, and a latch position, where said latch portion is disposed in said insert slot, and a biasing member disposed in said latch displacing space to bias said latch portion to the latch position; and a plurality of comb plates, each having an insert plate portion which is configured to be inserted into said insert slot in the first transverse direction, and which has two plate major surfaces (312, 313) that are configured to be attached to said front and rear wall surfaces (127, 117), respectively, a latch hole that extends from one of said plate major surfaces (312, 313) toward the other one of said plate major surfaces (312, 313) and that is registered with said latch displacing path when said insert plate portion is inserted into said insert slot so as to permit retaining of said latch portion in said latch hole when said latch portion is in the latch position, and a plate minor surface that interconnects said plate major surfaces (312, 313), and a comb portion which extends from said plate minor surface in the first transverse direction to project outwardly of said tool body. said tool body further has a latch displacing space which extends therein from said insert slot and which defines a latch displacing path; said pet grooming tool further comprising a latch unit including a latch member having a latch portion which is disposed to be displaceable along the latch displacing path between an unlatch position, where said latch portion is disposed in said latch displacing space, and a latch position, where said latch portion is disposed in said insert slot, and a biasing member disposed in said latch displacing space to bias said latch portion to the latch position; and a plurality of comb plates, each having an insert plate portion which is configured to be inserted into said insert slot in the first transverse direction, and which has two plate major surfaces (312, 313) that are configured to be attached to said front and rear wall surfaces (127, 117), respectively, a latch hole that extends from one of said plate major surfaces (312, 313) toward the other one of said plate major surfaces (312, 313) and that is registered with said latch displacing path when said insert plate portion is inserted into said insert slot so as to permit retaining of said latch portion in said latch hole when said latch portion is in the latch position, and a plate minor surface that interconnects said plate major surfaces (312, 313), and a comb portion which extends from said plate minor surface in the first transverse direction to project outwardly of said tool body.