PURPOSE: To provide the assembled type light emitting diode display device which facilitates the operation to mount and dismount the device to and from a panel and has good working efficiency.

CONSTITUTION: A blind square case 2 opened in the upper part is projectingly provided with 4 pieces of screw guide cylinders 9. A connector 11 is mounted to a lead wire leading out hole 6 formed on the base 7 of a case 2. Gaskets 12 are so provided as to enclose the circumference of the lead wire leading out hole 6 and the circumferences of screw insertion holes 8. A substrate 3 mounted with plural pieces of the light emitting diodes 20 is mounted in the case 2 and is sealed by a resin 14. The mounting of the display device 1 to the panel 30 is executed by inserting stop screws into the screw insertion holes 8 and screwing the screws into the threaded holes of the panel 30 and is, therefore, executable from the front surface side of the panel 30. The infiltration of water into the inside of the mounted display device 1, etc., is prevented by the gaskets 12.