Electronic device

An electronic device comprising:

• a mounted circuit board including a circuit board and a heat generating part mounted on the circuit board;
• a case including a substrate insertion slot which enables insertion of the mounted circuit board therethrough and housing the mounted circuit board;
• and,
• a heat conduction member fixed in the case and in contact to a part of the mounted circuit board on which the heat generating part is mounted and made of a heat conductive material, wherein
• the case includes
• a pair of guiderails that is to support sides of the mounted circuit board, respectively, and guides the mounted circuit board backward in the case when the mounted circuit board is inserted from the circuit board insertion slot;
• and
• the circuit board includes
• a component mounting part that has a width shorter than a distance between the pair of guiderails and on which an electronic component is mounted, and
• a pair of backside projected parts that protrudes in a width direction from the component mounting part at case-backside ends of the circuit board, respectively, wherein
• a width K2 which is a sum of a width of the component mounting part and widths of the backside projected parts, is between a distance G1 and a distance G2,
• the distance G1 is a length between the pair of the guiderails, and
• the distance G2 is a length which is a sum of the distance between the pair of the guiderails and the widths of the guiderails in the width direction,
• the pair of guiderails has supporting surfaces, respectively, that is to support the circuit board and placed at positions such that a clearance is formed between a case-backside end of the circuit board and the heat conduction member in a direction perpendicular to the circuit board when the circuit board is supported by the supporting surfaces,
• a distance G3 from the circuit board insertion slot to an end of the guiderail on the side of the case backside, is shorter than a distance K4 from an end of the circuit board on the side of the circuit board insertion slot to an end of each of the backside projected parts on the side of the circuit board insertion slot.