The invention provides a transmission noise suppressing structure and a wiring board capable of suppressing a transmission noise transferred through a power supply line, stabilizing a power supply voltage, and reducing signal transmission line cross talk transmitted through the power supply line or a ground layer without being affected by a resistive layer. A transmission noise suppressing structure includes a power supply line and a signal transmission line arranged apart from each other on the same surface; a ground layer arranged apart from the power supply line and the signal transmission line; and a resistive layer arranged apart from the power supply line and the ground layer. The resistive layer has an area (I) which faces the power supply line and an area (II) which does not face the power supply line. The resistive layer and the signal transmission line are apart from each other.