Coil device

1. A coil device, comprising:

a coil portion formed by a wire wound in a coil shape;

an element body containing the coil portion where a part of an outer circumference of a lead-out part of the coil portion is exposed as an exposed portion from a bottom surface of the element body and where the rest of the outer circumference of the lead-out part of the coil portion is embedded as an embedded portion in the element body; and

a terminal electrode formed on the bottom surface of the element body and connected with the exposed portion,

wherein an embedded length of the outer circumference of the lead-out part in the embedded portion is larger than a substantially half of a full length of the outer circumference of the lead-out part,

the element body comprises a first layer having a support portion configured to support the coil portion,

a step configured to accommodate the lead-out part is formed on a bottom surface of the support portion opposite to a front surface of the support portion configured to support the coil portion, and

a height of the step is smaller than a diameter of the lead-out part.

2. The coil device according to claim 1 , wherein an exposed length of the outer circumference of the lead-out part in the exposed portion is smaller than the substantially half of the full length of the outer circumference of the lead-out part.

3. The coil device according to claim 1 , wherein the element body comprises a winding core formed on the front surface of the support portion and configured to be positioned inside the coil portion.

4. The coil device according to claim 2 , wherein the element body comprises a winding core formed on the front surface of the support portion and configured to be positioned inside the coil portion.

5. The coil device according to claim 1 , wherein the element body comprises a second layer whose permeability is smaller than that of the first layer.

6. The coil device according to claim 2 , wherein the element body comprises a second layer whose permeability is smaller than that of the first layer.

7. The coil device according to claim 3 , wherein the element body comprises a second layer whose permeability is smaller than that of the first layer.

8. The coil device according to claim 1 , wherein:

the lead-out part comprises a first lead-out part and a second lead-out part extending substantially in parallel to the first lead-out part;

the step comprises a first step and a second step;

the first lead-out part extends along the first step; and

the second lead-out part extends along the second step.

9. The coil device according to claim 3 , wherein:

the lead-out part comprises a first lead-out part and a second lead-out part extending substantially in parallel to the first lead-out part;

the step comprises a first step and a second step;

the first lead-out part extends along the first step; and

the second lead-out part extends along the second step.

10. The coil device according to claim 5 , wherein:

the lead-out part comprises a first lead-out part and a second lead-out part extending substantially in parallel to the first lead-out part;

the step comprises a first step and a second step;

the first lead-out part extends along the first step; and

the second lead-out part extends along the second step.

11. A coil device, comprising:

a coil portion formed by a wire wound in a coil shape;

an element body containing the coil portion where a part of an outer circumference of a lead-out part of the coil portion is exposed as an exposed portion from a bottom surface of the element body and where the rest of the outer circumference of the lead-out part of the coil portion is embedded as an embedded portion in the element body; and

a terminal electrode formed on the bottom surface of the element body and connected with the exposed portion,

wherein an embedded length of the outer circumference of the lead-out part in the embedded portion is larger than a substantially half of a full length of the outer circumference of the lead-out part,

a step configured to accommodate the lead-out part is formed on a bottom surface of the element body, and

a height of the step is smaller than a diameter of the lead-out part.

12. A coil device, comprising:

a coil portion formed by a wire wound in a coil shape;

an element body containing the coil portion where a part of an outer circumference of a lead-out part of the coil portion is exposed as an exposed portion from a bottom surface of the element body and where the rest of the outer circumference of the lead-out part of the coil portion is embedded as an embedded portion in the element body; and

a terminal electrode formed on the bottom surface of the element body and connected with the exposed portion,

wherein an embedded length of the outer circumference of the lead-out part in the embedded portion is larger than a substantially half of a full length of the outer circumference of the lead-out part,

the element body comprises a first layer having a support portion configured to support the coil portion,

a step configured to accommodate the embedded portion is formed on a bottom surface of the support portion opposite to a front surface of the support portion configured to support the coil portion,

a filling layer forming a part of the element body is filled in the step, and

the embedded portion is covered with the filling layer.