A biological information detection apparatus comprising: a detection unit which has a light receiving unit configured to receive light from a subject; a light transmitting member which is provided on a housing surface side configured to be in contact with the subject of the biological information detection apparatus, which is configured to transmit light from the subject, and which has a convex portion configured to be in contact with the subject to give a pressing force to the subject when measuring biological information of the subject, at least a part of said convex portion being configured to protrude toward the subject, wherein the light transmitting member has a body portion provided on the lower side of the convex portion, said lower side being configured to be opposite to the subject; and a pressing force suppression unit which is provided so as to surround the convex portion on the housing surface, and which is configured to suppress the pressing force given to the subject by the convex portion, wherein, when a value obtained by subtracting the height of the pressing force suppression unit from the height of the convex portion in a direction orthogonal to the housing surface is Δh, Δh > 0, characterized in that the body portion is formed to extend from the position of the convex portion to the lower side of a cover member of the housing surface, in such a manner that an extended part of the body portion is covered by said cover member and has an uncovered portion whose surface on the subject side adjoins a surface of the cover member in a flush manner, a pressing force suppression surface of the pressing force suppression unit being formed by said surface of the cover member. a detection unit which has a light receiving unit configured to receive light from a subject; a light transmitting member which is provided on a housing surface side configured to be in contact with the subject of the biological information detection apparatus, which is configured to transmit light from the subject, and which has a convex portion configured to be in contact with the subject to give a pressing force to the subject when measuring biological information of the subject, at least a part of said convex portion being configured to protrude toward the subject, wherein the light transmitting member has a body portion provided on the lower side of the convex portion, said lower side being configured to be opposite to the subject; and a pressing force suppression unit which is provided so as to surround the convex portion on the housing surface, and which is configured to suppress the pressing force given to the subject by the convex portion, wherein, when a value obtained by subtracting the height of the pressing force suppression unit from the height of the convex portion in a direction orthogonal to the housing surface is Δh, Δh > 0, characterized in that the body portion is formed to extend from the position of the convex portion to the lower side of a cover member of the housing surface, in such a manner that an extended part of the body portion is covered by said cover member and has an uncovered portion whose surface on the subject side adjoins a surface of the cover member in a flush manner, a pressing force suppression surface of the pressing force suppression unit being formed by said surface of the cover member.