The arrestee was identified as Nizamuddin Sardar Mizan, 30, a local bus driver.
Rab men arrested him in a drive from Dhamrai area in the afternoon, Rab sources said.
Mizan raped the girl on October 21 and put her under lock and key in a room from where the victim was rescued later.
Victim’s father filed a case under the Women and Children Repression Prevention Act over the matter.
Also read: Child rape increased 76.01pc in Bangladesh last year: BSAF