A manually operated hair trimming device having a barrel which is rolled over hair to be trimmed. The barrel has at least one aperture through which hair is able to protrude. The device has a first cutting blade provided inside the barrel and a second cutting blade is associated with the barrel. In use, as the barrel is rolled over hair to be trimmed, hair protrudes through the at least one aperture and is cut by a shearing force between relatively moving first and second cutting blades.