A curtain rail device adapted to be connected to a curtain fabric, said curtain rail device comprising: a rail body extending in a longitudinal direction and having a bottom portion that is adapted to be connected to the curtain fabric and a front portion that is formed with a first engaging section extending in the longitudinal direction; and an ornamental member having a second engaging section that engages removably said first engaging section of said rail body and an ornamental section that is connected to a front end of said second engaging section and that is disposed in front of said front portion of said rail body; wherein said rail body comprises a first upright wall; a second upright wall disposed in front of and parallel to said first upright wall; a connecting wall interconnecting said first and second upright walls (12, 13), and cooperating with said first and second upright walls (12, 13) to define a lower engaging groove that opens downwardly and that is adapted to be engaged with the curtain fabric; and a pair of rail members, which extend in the longitudinal direction and are disposed in front of and connected respectively to top and bottom ends of said second upright wall, said rail members and said second upright wall cooperating to serve as said first engaging section and to define a first engaging groove for removable engagement with said second engaging section of said ornamental member; and each of said rail members is substantially L-shaped and has a first segment projecting forwardly from the respective one of said top and bottom ends of said second upright wall, and a second segment extending from a distal end of said first segment toward the opposite one of said rail members; characterized in that said second engaging section is substantially T-shaped and comprises a first segment that extends rearwardly from said ornamental section and a second segment that is connected to a rear end of said first segment and that cooperates with said first segment and said ornamental section to define a pair of second engaging grooves for respective removable engagement with said second segments of said rail members, so that said second engaging section of said ornamental member engages fittingly said first engaging section of said rail body. a rail body extending in a longitudinal direction and having a bottom portion that is adapted to be connected to the curtain fabric and a front portion that is formed with a first engaging section extending in the longitudinal direction; and an ornamental member having a second engaging section that engages removably said first engaging section of said rail body and an ornamental section that is connected to a front end of said second engaging section and that is disposed in front of said front portion of said rail body; wherein said rail body comprises a first upright wall; a second upright wall disposed in front of and parallel to said first upright wall; a connecting wall interconnecting said first and second upright walls (12, 13), and cooperating with said first and second upright walls (12, 13) to define a lower engaging groove that opens downwardly and that is adapted to be engaged with the curtain fabric; and a pair of rail members, which extend in the longitudinal direction and are disposed in front of and connected respectively to top and bottom ends of said second upright wall, said rail members and said second upright wall cooperating to serve as said first engaging section and to define a first engaging groove for removable engagement with said second engaging section of said ornamental member; and each of said rail members is substantially L-shaped and has a first segment projecting forwardly from the respective one of said top and bottom ends of said second upright wall, and a second segment extending from a distal end of said first segment toward the opposite one of said rail members; characterized in that said second engaging section is substantially T-shaped and comprises a first segment that extends rearwardly from said ornamental section and a second segment that is connected to a rear end of said first segment and that cooperates with said first segment and said ornamental section to define a pair of second engaging grooves for respective removable engagement with said second segments of said rail members, so that said second engaging section of said ornamental member engages fittingly said first engaging section of said rail body.