Ceiling panel

1. A ceiling panel having a connection portion at one of end portions on both sides in a first direction of a panel body in a shape of a rectangular flat plate, the connection portion connecting with a connected portion of an adjacent ceiling panel,

wherein the connection portion is fixed to the end portion by a fastener, the fastener being fastened to an insertion part inserted into a layer of the panel body from a cut portion opening on a back face of the end portion so as to penetrate a securing part provided along the back face of the end portion.

2. The ceiling panel according to claim 1 ,

wherein the connection portion is provided for a connection member having a base end side part constituting the securing part, and the cut portion is provided so as to extend in the first direction.

3. The ceiling panel according to claim 2 ,

wherein the insertion part is bent from one side portion of the base end side part in a second direction orthogonal to the first direction and is integrally provided for the connection member.

4. The ceiling panel according to claim 2 ,

wherein the base end side part has an extension portion extending inward in the first direction further than the insertion part.

5. The ceiling panel according to claim 1 ,

wherein the connection portion is provided for a connection member having the insertion part, and the cut portion is provided so as to extend in the second direction orthogonal to the first direction.

6. The ceiling panel according to claim 1 ,

wherein the cut portion is provided at two positions spaced in parallel, the insertion part is inserted into one cut portion and a tip end portion in an insertion direction of the insertion part is exposed on a back face side of the panel body through the other cut portion.

7. The ceiling panel according to claim 1 , wherein the panel body is constructed such that a reinforcement layer is piled upon a back face side of a base member of a resin foam system or a fiber system, and the cut portion is formed by penetrating the reinforcement layer.

8. The ceiling panel according to claim 3 ,

wherein the base end side part has an extension portion extending inward in the first direction further than the insertion part.

9. The ceiling panel according to claim 2 ,

wherein the cut portion is provided at two positions spaced in parallel, the insertion part is inserted into one cut portion and a tip end portion in an insertion direction of the insertion part is exposed on a back face side of the panel body through the other cut portion.

10. The ceiling panel according to claim 3 ,

wherein the cut portion is provided at two positions spaced in parallel, the insertion part is inserted into one cut portion and a tip end portion in an insertion direction of the insertion part is exposed on a back face side of the panel body through the other cut portion.

11. The ceiling panel according to claim 4 ,

wherein the cut portion is provided at two positions spaced in parallel, the insertion part is inserted into one cut portion and a tip end portion in an insertion direction of the insertion part is exposed on a back face side of the panel body through the other cut portion.

12. The ceiling panel according to claim 2 ,

wherein the panel body is constructed such that a reinforcement layer is piled upon a back face side of a base member of a resin foam system or a fiber system, and the cut portion is formed by penetrating the reinforcement layer.

13. The ceiling panel according to claim 3 ,

wherein the panel body constructed such that a reinforcement layer is piled upon a back side of a base member of a resin foam system or a fiber system, and the cut portion is formed by penetrating the reinforcement layer.

14. The ceiling panel according to claim 4 ,

wherein the panel body is constructed such that a reinforcement layer is piled upon a back face side of a base member of a resin foam system or a fiber system, and the cut portion is formed by penetrating the reinforcement layer.

15. The ceiling panel according to claim 5 ,

wherein the panel body is constructed such that a reinforcement layer is piled upon a back face side of a base member of a resin foam system or a fiber system, and the cut portion is formed by penetrating the reinforcement layer.

16. The ceiling panel according to claim 6 ,

wherein the panel body is constructed such that a reinforcement layer is piled upon a back face side of a base member of resin foam system or a fiber system, and the cut portion is formed by penetrating the reinforcement layer.

17. The ceiling panel according to claim 5 ,

wherein the cut portion is provided at two positions spaced in parallel, the insertion part is inserted into one cut portion and a tip end portion in an insertion direction of the insertion part is exposed on a back face side of the panel body through the other cut portion.

18. The ceiling panel according to claim 8 ,

wherein the cut portion is provided at two positions spaced in parallel, the insertion part is inserted into one cut portion and a tip end portion in an insertion direction of the insertion part is exposed on a back face side of the panel body through the other cut portion.

19. The ceiling panel according to claim 8 ,

wherein the panel body is constructed such that a reinforcement layer is piled upon a back face side of a base member of a resin foam system or a fiber system, and the cut portion is formed by penetrating the reinforcement layer.

20. The ceiling panel according to claim 17 ,

wherein the panel body is constructed such that a reinforcement layer is piled upon a back face side of a base member of a resin foam system or a fiber system, and the cut portion is formed by penetrating the reinforcement layer.