Vehicle-mounted device

1. A vehicle-mounted device comprising:

a device main body;

a device base that is part of the device main body; and

a support member configured to support the device base on a vehicle side,

wherein the device base has formed therein a support fixing portion to which the support member is fixed, a base main body portion other than the support fixing portion, and a preferential rupture portion between the support fixing portion and the base main body portion,

wherein the support fixing portion and the support member attached to the support fixing portion constitute a rupture fixed portion, and the base main body portion is separable from the rupture fixed portion if the preferential rupture portion ruptures, and

wherein one of the rupture fixed portion and the base main body portion is provided with a hook member, and the hook member is provided with a hooking portion that is hooked to the other of the rupture fixed portion and the base main body portion when the base main body portion separates from the rupture fixed portion.

2. The vehicle-mounted device according to claim 1 , wherein the device base is provided with a base wall, and the support fixing portion and the base main body portion are part of the base wall.

3. The vehicle-mounted device according to claim 2 , wherein the hooking portion of the hook member is provided at least at two points on opposite sides of the support fixing portion.

4. The vehicle-mounted device according to claim 3 , wherein the hook member is attached to the rupture fixed portion, and the hooking portion is hookable to an inner side portion of the base main body portion facing an inside of the device main body.

5. The vehicle-mounted device according to claim 4 , wherein the hook member is formed with a metal plate having elasticity, the metal plate has a folded-back portion, and a front end portion of the folded-back portion serves as the hooking portion,

wherein the device base has a hole portion formed therein between the support fixing portion and the base main body portion, and wherein the hook member is elastically deformed and passes through the hole portion so that the hooking portion is hookable to the inner side portion of the base main body portion.

6. The vehicle-mounted device according to claim 5 , wherein the support member is attached to the support fixing portion by using a fixing screw and the hook member is attached to the support fixing portion by using the fixing screw.

7. The vehicle-mounted device according to claim 3 , wherein the hook member is attached to the base main body portion, and the hooking portion is hookable to an outer side portion of the rupture fixed portion facing the outside of the device main body.

8. The vehicle-mounted device according to claim 7 , wherein the hooking portion is formed with a metal plate having elasticity.

9. A vehicle-mounted device comprising:

a device body;

a support member configured to support the device body,

wherein the device body has formed therein a support fixing portion to which the support member is fixed and a preferential rupture portion between the support fixing portion and a remainder of the device body,

wherein the support fixing portion and the support member attached to the support fixing portion constitute a rupture fixed portion, and the remainder of the device body is separable from the rupture fixed portion if the preferential rupture portion ruptures, and

wherein one of the rupture fixed portion and the remainder of the device body is provided with a member having an elastic engaging portion that is engaged to the other when the remainder of the device body separates from the rupture fixed portion.

10. The vehicle-mounted device according to claim 9 , wherein the device body is provided with a base wall, and the support fixing portion is part of the base wall.

11. The vehicle-mounted device according to claim 10 , wherein the elastic engaging portion of the member is provided at least at two points on opposite sides of the support fixing portion.

12. The vehicle-mounted device according to claim 11 , wherein the member is attached to the rupture fixed portion, and the elastic engaging portion is configured to engage an inner side portion of the base wall facing an inside of the device body.

13. The vehicle-mounted device according to claim 12 , wherein the member is formed with a metal plate having elasticity, the metal plate has a folded-back portion, and a front end portion of the folded-back portion serves as the elastic engaging portion,

wherein the base wall has a hole portion formed therein between the support fixing portion and the remainder of the base wall, and

wherein the member is elastically deformed and passes through the hole portion so that the elastic engaging portion is configured to engage the inner side portion of the base wall.

14. The vehicle-mounted device according to claim 13 , wherein the support member is attached to the support fixing portion by using a fixing screw and the hook member is attached to the support fixing portion by using the fixing screw.

15. The vehicle-mounted device according to claim 11 , wherein the member is attached to the base wall, and the elastic engaging portion is configured to engage an outer side portion of the rupture fixed portion facing the outside of the device body.

16. The vehicle-mounted device according to claim 15 , wherein the elastic engaging portion is formed with a metal plate having elasticity.