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A wiring board comprises a first pad which is provided on a first surface side of a substrate and on which a first electronic component is to be mounted, and a second pad which is provided on the first surface side of the substrate and on which a second electronic component having a larger amount of

A wiring board comprises a first pad which is provided on a first surface side of a substrate and on which a first electronic component is to be mounted, and a second pad which is provided on the first surface side of the substrate and on which a second electronic component having a larger amount of heat generation in an operation than that of the first electronic component is to be mounted, a first through electrode which penetrates the substrate and has one of ends connected electrically to the first pad, a second through electrode which penetrates the substrate and has one of ends connected electrically to the second pad, a through trench penetrating the substrate in a portion positioned between a first mounting region for the first electronic component and a second mounting region for the second electronic component, and a heat intercepting member provided in the through trench.

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1. A wiring board comprising: a substrate formed by a semiconductor material, a first pad which is provided on a first surface side of the substrate and on which a first electronic component is to be mounted, and a second pad which is provided on the first surface side of the substrate and on which

1. A wiring board comprising: a substrate formed by a semiconductor material, a first pad which is provided on a first surface side of the substrate and on which a first electronic component is to be mounted, and a second pad which is provided on the first surface side of the substrate and on which a second electronic component having a larger amount of heat generation in an operation than that of the first electronic component is to be mounted;a first through electrode which penetrates the substrate and has one end connected electrically to the first pad;a second through electrode which penetrates the substrate and has one end connected electrically to the second pad;a through trench which penetrates the substrate and which is provided on the substrate in a portion positioned between a first mounting region on which the first electronic component is to be mounted and a second mounting region on which the second electronic component is to be mounted; anda heat intercepting member which is provided in the through trench,wherein a thermal conductivity of the heat intercepting member is less than a thermal conductivity of the substrate. 2. The wiring board according to claim 1, wherein the through trench is provided to surround the substrate in a corresponding portion to the second mounting region. 3. The wiring board according to claim 1, wherein a material of the heat intercepting member is a resin or a resin including a filler. 4. The wiring board according to claim 1, wherein a thermal conductivity of the heat intercepting member is in the range of 0.1 to 1.0 W/m·K, anda thermal conductivity of the substrate is in the range of 150 to 170 W/m·K. 5. The wiring board according to claim 1, wherein the substrate is made of silicon. 6. The wiring board according to claim 1, wherein a first external connecting pad connected to the other end of the first through electrode and a second external connecting pad connected to the other end of the second through electrode are provided on a second surface side of the substrate. 7. The wiring board according to claim 1, wherein an insulating film is formed on the surface of the semiconductor substrate, and the respective pads and through electrodes are formed via the insulating film. 8. The wiring board according to claim 1, wherein a thermal conductivity of the heat intercepting member is in the range of 0.1 to 1.0 W/m·K. 9. A wiring board comprising: a substrate formed by a semiconductor material, a first pad which is provided on a first surface side of the substrate and on which a first electronic component is to be mounted, and a second pad which is provided on the first surface side of the substrate and on which a second electronic component having a larger amount of heat generation in an operation than that of the first electronic component is to be mounted;a first through electrode which penetrates the substrate and has one end connected electrically to the first pad;a second through electrode which penetrates the substrate and has one end connected electrically to the second pad;a trench which does not penetrate the substrate and which is provided on the substrate in a portion positioned at an opposite side to the first surface in the substrate in a portion positioned between a first mounting region on which the first electronic component is to be mounted and a second mounting region on which the second electronic component is to be mounted; anda heat intercepting member which is provided in the trench,wherein a thermal conductivity of the heat intercepting member is less than a thermal conductivity of the substrate. 10. The wiring board according to claim 9, wherein the trench is provided to surround the substrate in a corresponding portion to the second mounting region. 11. The wiring board according to claim 9, wherein a material of the heat intercepting member is a resin or a resin including a filler. 12. The wiring board according to claim 9, wherein a thermal conductivity of the heat intercepting member is in the range of 0.1 to 1.0 W/m·K, anda thermal conductivity of the substrate is in the range of 150 to 170 W/m·K. 13. The wiring board according to claim 9, wherein the substrate is made of silicon. 14. The wiring board according to claim 9, wherein a first external connecting pad connected to the other end of the first through electrode and a second external connecting pad connected to the other end of the second through electrode are provided on a second surface side of the substrate. 15. The wiring board according to claim 9, wherein an insulating film is formed on the surface of the semiconductor substrate, and the respective pads and through electrodes are formed via the insulating film. 16. The wiring board according to claim 9, wherein a thermal conductivity of the heat intercepting member is in the range of 0.1 to 1.0 W/m·K.