A loop-type heat pipe comprising: an evaporator that vaporizes a working fluid; a condenser that liquefies the working fluid; a liquid pipe by which the evaporator and the condenser are connected to each other; and a vapor pipe by which the evaporator and the condenser are connected to each other, wherein the vapor pipe and the liquid pipe form a loop, wherein the evaporator is formed by layered metal layers (61 to 66) and the layered metal layers (61 to 66) forming the evaporator comprise: a first outermost metal layer positioned on one outer side in a layering direction of the layered metal layers; a second outermost metal layer positioned on the other outer side opposite to the one outer side in the layering direction; and an inner layer (62 to 65) positioned between the first outermost metal layer and the second outermost metal layer, wherein the inner layer (62 to 65) comprises: a first metal layer adjacent to the first outermost metal layer; and a second metal layer adjacent to the second outermost metal layer, wherein at least one space (81, 82) where vapor generated by vaporizing the working fluid flows and a porous member that communicates with the at least one space (81, 82) are provided in the inner layer (62 to 65), characterized in that the first metal layer is formed with a first bottomed groove (81a, 82a) opened to a side of the second metal layer, and the second metal layer is formed with a second bottomed groove (81d, 82d) opened to a side of the first metal layer side, wherein one end of the space (81, 82) in the layering direction is closed by a portion of the first metal layer where the first bottomed groove (81a, 82a) is formed, and the other end of the space (81, 82) in the layering direction is closed by a portion of the second metal layer where the second bottomed groove (81d, 82d) is formed. an evaporator that vaporizes a working fluid; a condenser that liquefies the working fluid; a liquid pipe by which the evaporator and the condenser are connected to each other; and a vapor pipe by which the evaporator and the condenser are connected to each other, wherein the vapor pipe and the liquid pipe form a loop, wherein the evaporator is formed by layered metal layers (61 to 66) and the layered metal layers (61 to 66) forming the evaporator comprise: a first outermost metal layer positioned on one outer side in a layering direction of the layered metal layers; a second outermost metal layer positioned on the other outer side opposite to the one outer side in the layering direction; and an inner layer (62 to 65) positioned between the first outermost metal layer and the second outermost metal layer, wherein the inner layer (62 to 65) comprises: a first outermost metal layer positioned on one outer side in a layering direction of the layered metal layers; a second outermost metal layer positioned on the other outer side opposite to the one outer side in the layering direction; and an inner layer (62 to 65) positioned between the first outermost metal layer and the second outermost metal layer, wherein the inner layer (62 to 65) comprises: a first metal layer adjacent to the first outermost metal layer; and a second metal layer adjacent to the second outermost metal layer, wherein at least one space (81, 82) where vapor generated by vaporizing the working fluid flows and a porous member that communicates with the at least one space (81, 82) are provided in the inner layer (62 to 65), characterized in that the first metal layer is formed with a first bottomed groove (81a, 82a) opened to a side of the second metal layer, and the second metal layer is formed with a second bottomed groove (81d, 82d) opened to a side of the first metal layer side, wherein one end of the space (81, 82) in the layering direction is closed by a portion of the first metal layer where the first bottomed groove (81a, 82a) is formed, and the other end of the space (81, 82) in the layering direction is closed by a portion of the second metal layer where the second bottomed groove (81d, 82d) is formed.