The present invention provides a phenolic resin foam plate more than 50mm thickness, slicing cut at 5mm intervals in the thickness direction from the one main surface of the phenolic resin foam plate along the main surface, becomes n Like sections was a Q1~Qn from the main surface side in order, the average density of each Q1~Qn when the _d q1 _{to d qn,} to the average value _{d qave} of _{d q2 ~d q (n-1} ), d q2 ~d minimum value _{d qmin} ratio of _{q (n-1) (d} qmin / d qave) is a _{0.91 ≦ d qmin / d qave ≦} 0.98, D i = (d q (i- _{1) + d qi + d q} (i + 1)) / 3 calculates a [i is an integer of 2~ (n-1), where if i is 2, the (n-1), respectively _D 2 _{= d q2,} and _{D (n-1) = d} q (n-1). ], By plotting the Di in the order of numerical values ​​of i (i is the abscissa, Di is the vertical axis), when obtaining the connecting it density distribution lines the values ​​of Di, the horizontal axis intersecting in the density distribution line and the 4-point a straight line parallel there with, to provide a phenolic resin foam plate.
According to the present invention, even when a large product thickness may be a phenolic resin foamed plate showing a practically sufficient compressive strength and thermal conductivity.